Enjoy your day off. Reward yourself with Shelly's mouth.

After cleaning up another pair of underwear that's been coated in your jizz, something you noted that seems to be happening more often lately, you went down to the dining table and sat down as you greeted Mom, "Morning."

"Morning sweetie." She greeted back, setting down a plate of WHO TOUCHA MY SPAGHET-

Ahem...

A plate of spaghetti in front of you,

Shelly came down right after, giggling as she steps up and hugs you from behind, "Morning little brother!"

She gave you a great big smooch on the left of your lips that lasted way too long to even consider it to be a normal sibling kiss. Then to make matters worse, she starts rubbing her breasts right up the back of your head, where you can feel every soft squish.

Your mom looks on with a smile, thinking it was just a normal sibling bonding moment, completely unaware of the deeper context behind.

"You two have gotten so much closer these past few days. Not that I'm complaining, but did I miss something?" Your mom asked.

"Let's just say I felt bad we weren't getting along, and reached out first by apologizing to him. He gave me a real mouthful after that, but now we get to bond with eachother every day." Shelly explained, giving you another kiss with an extremely obvious lewd moan with.

"Aw, that's so sweet." You mom smiled cheerfully.

Man, you were lucky that mom was super dense. If it was anyone else, they would have immediately connected the dots.

You laughed awkwardly, before flicking Shelly's arm really hard as a sign to cut it out.

It didn't help, since she just makes another moan, "You're so rough when you're handling your older sister."

Oh my god, she is literally the worst.

"Okay Shelly, don't coddle your brother too much." Mom admonished her, "You're distracting him from eating breakfast. Come sit down and eat your plate too."

"Okay..." Shelly sighed, before giving you a peck on the lips. "Hey John, when we're done eating, let's go hang out in my room. I learned a cool new trick with my tongue that I want to experiment with your help-"

You coughed loudly, hoping mom didn't hear the last part of that sentence.

Dammit Shelly, it's like you're trying to get caught by mom or something!

Thankfully, the teasing does stop there with your mom none the wiser. Shelly sits down and eats her breakfast without a fuss.

For the rest of breakfast though, Shelly continues to give you her bedroom eyes as she purposely makes a mess eating her spaghetti, dirtying her fingers so that she has an excuse to lick and suck on them suggestively as you watch.

Sigh... Your sister's been acting really ornery lately since you haven't let her suck you off for the whole day yesterday. Last night, you even locked your bedroom doors just in case so that she doesn't sneak in like last time.

She doesn't seem to realize how you're still not very comfortable with your new incestual relationship yet.

You have a feeling she's going to keep this up until you eventually cave in and fuck her mouth. Sadly for you, her plan is starting to work. You keep catching yourself staring at her everytime she does something perverted, your pants growing extremely tight ever since breakfast started.

Dammit, she's going to drive you crazy someday. Curse your young male hormones for making you so weak.

When your mom wasn't paying attention, you angrily mouthed the words, "Fine, I get it! I'll let you blow me, so just stop!"

Just like that, your sister immediately went back to normal, cleaning herself up and quickly finishing up her spaghetti as fast as she naturally can.

Jeez.

Time passes, and breakfast ends quickly enough.

Your mom kisses you both goodbye as she heads off to her job, leaving you both alone at home.

Once she's gone, Shelly had this predatory look in her eye when she walks up to you.

"You are the worst sister, you know that?" You told her.

"Most guys would kill to have such a beautiful girl like myself who's more than willing to suck their cock every day." She countered.

"I'm sure most of those guys would change their mind if they find out it's their own sisters."

She laughed, "HAHAHA! Oh, young naive brother... You'd be surprised how many would consider that as an added bonus."

"That's gross."

Shelly didn't bother to reply any further, grabbing your arm and leading you to her room. Once there, she slammed the door shut and pinned you against the wall, forcing her tongue in your mouth as she roughly made out with you.

For just a moment, you let her have her way with you, too horny to fight back.

But you couldn't help but feel... uncomfortable about this.

You pushed her away, her saliva dripping down your chin as she looked at you confused.

"C-Can we not do the whole... kissing stuff?" You looked away awkwardly, suddenly feeling embarassed.

"Oh, you want to skip that whole fluff and just jump straight into it?" She smiled lewdly, "I can respect that."

You didn't want to correct her on what your reasons where, laying back on the wall with your face flushed as she got down on her knees and pulled your pants off.

Your erection bounced and hit her in the face, and you moaned as she immediately started licking and kissing it.

"Fuck, I miss your cock!" She grunted, using her hand to jack you off while inhaling your balls. With a giant slurp, she continued, "I can't believe you locked your doors last night to keep me out! That's so mean!"

You gasped for breath as she lapped up the precum oozing under your tip, "You used to lock your room to keep me out too!"

"Well, I mean, yeah. But not anymore!" She admitted, "That was back then before your cock. This is right now."

She engulfed your dick into her mouth, forcing it down her throat and leaving it there for a moment for you to savor it. Then she started bobbing her head up and down, her tongue licking every inch of your cock as her lips and throat massaged it.

You groaned, and thrusted forward to make her swallow more of it, the pleasure tingling throughout your entire body.

No matter how many times she's done this for you, each time still felt as good as the first.

She suddenly stopped for some reason, making you feel disappointed until she stood up and took off her top. Asking you casually, "You like staring at my tits right?"

"Well... Uh... I mean..." You mumbled, staring at her giant tits.

"I don't want you to cum too quickly, so play with them for a while until your dick rests for a bit." She sits down on the bed and stretches her body to really put her boobs on display, "When I make you cum, I want you to blast a big load."

You found yourself hypnotized by her perky tits as she swings her giant puppies side to side. Without a word, you reached out and groped them to your heart's content, occasionally sucking her nipples to make her moan in delight.

"Ah, you're so rough with them!" she giggled, giving another moan as you kept licking them clean, "I always knew you were a boobs guy. I don't think I ever told you this, but I always remembered catching you staring at these babies back when you were going through puberty. It used to creep me out, so I started covering myself with more clothes to stop you from perving on me."

You let go of her tit with an audible pop, asking "You don't seem to care anymore. What changed your mind?"

"I guess I just got used to the attention." She shrugged, "Plus, you were starting to grow up really fast." She looked down at your throbbing erection, rubbing it a bit to tease it, "Really fast. Sometimes I liked to walk around the house without a bra on, just to make you squirm."

"Does... Does that mean you've always had incestuous feelings for me?" You stopped massaging her boobs to ask, curious to know how long she's been like this.

"Maybe." She shook her head, "I'd be lying if I said I didn't occasionally think of you like that. Once in a blue moon, I would fantasize you eating me out. I always thought that was normal though, and that everyone had thoughts like that sometimes. I mean, I'm pretty sure you jerked off thinking about me before, right?"

Well she's not wrong. This whole situation wasn't exactly a dream come true for you, but there have been times when you masturbated while imagining your sister naked as a passing thought. But nothing more than that.

In Shelly's case, it was different. The fact that she had feelings for you like this even back then... You really don't know how to feel about that.

She brought you out of your thoughts by taking your dick back in her mouth again, making you nearly limp from the sudden pleasure.

She popped off, chastising you, "Stop trying to distract me and just fuck my mouth already!" Then went back to bobbing her head down your cock again.

Her casual behavior about wanting you to fuck her mouth was still off-putting, yet strangely arousing. You held her head to keep you steady, thrusting your pelvis into her mouth to match her speed.

You find it amazing how she could easily keep up with the pressure, not once gagging or **** even as you jammed your dick in and out of her throat at a ridiculous speed.

You wondered how she got so good at this. She seemed more skilled at this than even most professional pornstars. Has she ever practiced on other guys before you?

You couldn't think on it further, feeling your breathing to be heavier as you felt your balls start boiling, begging for a release.

"Fuck, Shelly, I'm close to cumming..." You warned her.

Her eyes glanced up to you with a disappointing look, but sped up anyways.

The sound of your wet balls slapping against her chin as she rapidly bobbed her head, as well as her hands gripping on tightly to your hips, you couldn't find the strength to last any longer

You screamed as your cock began bursting out ropes of cum down her throat, Shelly wrapping her arms around your waist to **** herself to take your cock deep in her throat as she diligently swallowed each and every gulp.

You unconsciously rubbed her head as she kept swallowing, making her think you were encouraging her to keep going.

She started moving her head back and forth to milk your cock with her throat, forcing out every single drop of cum.

When you eventually emptied out, you sighed in relief, feeling your stress melt away as you enjoyed the afterglow.

Shelly refused to remove herself from your dick though, continuing to latch on like a leech.

"Shelly? I think I'm empty. You can let go now." You told her.

She shook her head no, even as you felt your cock deflate inside her.

"Okay... Why not?"

Instead of talking, she grabbed one of your hands to reach down and feel her crotch through her pants.

"Um... Are you trying to tell me that you haven't cummed yet?"

She nods her head yes, sucking on your flaccid cock and lapping it up with her tongue.

You hissed, still sensitive after your orgasm. "Shelly, come on. I don't think I have a second round in me today."

She shakes her head no again.

"Come on, can't you cum by yourself? Do you want me to, like, finger you myself?"

She shakes her head no again, this time with an angry look.

Well, she's really stubborn at least.

"How about if I go down on you instead? Would you want that?"

Shelly looked around, heavily considering the offer. Her favorite fetish was oral, after all, both giving and receiving. How you know that, you have no idea, but offering to eat her out would probably be enough to convince her to let go of your cock.

To your surprise, she still shook her head no.

"What? Not even if I offer to use my mouth to return the favor?"

She shook her head no.

"Why not?"

She sucked your cock again as a response.

Oh fuck, even though you just came a moment ago, that somehow was enough to bring you right back. The blood flowed back to your dick again, inflating it inside her mouth.

Feeling your cock grow hard again, she gave a muffled cheer of victory.

"O-Okay, so maybe I might have one more round in me after all." You shuddered out.

She went back to bouncing her head again, letting her lips do the heavy work on the base of your cock as her throat focused entirely on massaging your tip.

"Fuck, sis, you're way too good at this." You found yourself saying out loud without meaning to.

She hummed happily in response, her tongue circling around your dick as you kept thrusting into her.

"I have never known any girl out there that gets off just by sucking cock constantly. Are there others like you, or are you the only exception?"

She doesn't answer, instead pausing for a brief moment in order to carry her legs up to the bed, squatting in a way where her back straightened up and aligned perfectly with her throat, without letting go of your cock even once. Then she went back to hugging your waist and thrust her body forward.

You could feel half of your cock go down her throat, making you groan in ecstasy.

"I need to ask, how does this even work with you?" You asked as she continued to move her whole body towards your dick, "You're not even touching your vagina. How does having my cock in your mouth somehow get you off? Do you, like, have some sort of masturbation glands in your throat or something?"

She chuckles at that, the vibrations of her laugh going straight to your dick. She still doesn't answer, only focusing on going down on your dick with her body moving like an automatic piston.

Fuck, you can't handle this **** anymore, she was just too good!

You roughly grabbed her head and start pounding your pelvis into her mouth, shuddering as your mind starts deteriorating everytime your cock smoothly enters and exits her throat. You could barely think, the only thing on the forefront of your mind is to fuck her mouth to oblivion.

Shelly relaxes her body, allowing you to **** her throat in peace. Her pants were slowly starting to get moist in her crotch area.

You started making really perverted gasping noises everytime you plunged your cock right into her throat, your entire body sweating from the workout.

Shelly begins moaning in pleasure, tightly grabbing on to your waist as her eyes rolled up to the back of her skull.

This scene was starting to get a lot more familiar.

Without any warnings to each other, both of you began cumming at the same exact time, with you unleashing a new batch of raw semen down her throat for her to swallow, and her ruining her pants as she squirted out her organs juice like a geyser.

Your head lurched back, unable to handle how good your entire body felt at this exact moment.

The next few seconds for both of you was absolute bliss.

When it was over, Shelly weakened her grip on you, and you were able to finally pull out.

Both of you breathed heavily from exhaustion, completely satisfied.

"Little brother... You are the best dick I've ever sucked in my life. If it wasn't attached to you, I'd marry it." She said with a weak smile.

"That's gross, Shelly..." You panted, your exhausted and tired body falling over and landing right next to Shelly in her bed.

Hours passed.

You laid there in her bed, looking up at her ceiling in thought.

Shelly positioned herself to be right next to your flaccid dick, occasionally running her hands over your balls.

"Hey John? I got a question to ask you..." Shelly asked.

"Shoot."

"So... I get that you obviously aren't that comfortable with this whole situation. With us, I mean. Me being your sister and all." She started off, "Seems like I'm the only one out of either of us that actually looks forward to doing these **** stuff. So I wanted to know where exactly you draw the line."

"Draw the line?"

"Like, you're still a virgin, right? If you asked me to mount your dick and take your virginity, right here and now, I would be totally fine with it." She turns to look at you, "But the question I'm trying to ask is, are you fine with me doing something like that? Are you comfortable enough to let me, your sister, have actual penis-to-vagina sex with you? Are there certain boundaries that you aren't willing to cross when it comes to me?"

Oh... That was a pretty serious question to ask. You didn't really give it much thought.

You had to gather your thoughts for a moment, before answering, "If you want me to be honest... Then I guess you're right about me drawing the line somewhere. I'm still not use to thinking of you as a sexual partner. To me, you're still my sister. That fact sometimes creeps me out whenever I think about what we've done and how it's affected me so far."

"I see..." She looks at you in consideration.

"I... I don't think I'll ever be comfortable with the idea of having sex with you. I can stomach the idea of you giving me a blowjob, and I guess I'm pretty okay with me fingering you if you want... But actually having sex? That's probably where I draw the line..."

She hummed for a bit, before giving you a small smile, "Okay. Good to know then."

"You're alright with that, Shelly?"

"Yeah. I just wanted to ask to make sure I don't **** you to do something you don't want to do. I want this to be fun. It's not enjoyable if you don't enjoy it either."

"So, this is just for fun? For fun only? Nothing else?" You couldn't help but ask. "You're not, like, in love with me or anything, are you?"

"Pfft- HAHAHA," Shelly ended up laughing, "W-Wow! Are you actually worried about something like that?"

"C'mon, I'm serious. Please tell me the truth." You pleaded.

She hummed, "Well... Despite any impressions I might have given you, the answer is no. No, I'm not in love with you."

"Oh." You blinked.

"That's not to say I'm against the idea, though." She smiled with a wink, "If you ever decide to ask me out on a date, I might seriously consider it."

"Ha, yeah, no." You scoffed, "I don't think so."

"I figured." She chuckled, laying her head back down again.

A moment passes by in silence.

"D... Do you want this to stop?" She spoke up again.

"What?"

"I know you aren't into **** like me. I'm pretty sure this whole thing started because I **** you into it. So, like... If you want me to stop, I can stop doing this."

Shelly looked at you expectantly, almost nervous for an answer.

You thought about it.

...

"As long as it's just a fun way to relieve stress, and nothing else. Then I don't mind."

She seemed relieved to hear that.

"Awesome."

You stay like this for a while before cleaning yourselves up and hiding any evidence of sexual activity before Mom gets home.

You and your sister got to know each other a bit better and genuinely bonded like actual normal siblings for once. The two of you felt closer now than ever before.

Night comes, and dinner has already passed and was done with.

You go up to your room, prepared to end the night on a sound note. Closing the door, you briefly thought about locking it, before deciding, "Nah," trusting your sister to be responsible.

You got into bed, and you were instantly out like a light.