Returning home for the day

Sophia: Hey big brother, do you have a minute?

The message makes you chuckle. You type quickly.

John: For my sexy sister? Always.

Sophia: :D

Sophia: I need a favor. When we leave, can we drop off a friend of mine at the mall?

John: Depends. Is she hot?

Sophia: >:(

You chuckle to yourself, imagining Sophia frowning at her screen. Beneath that, she probably is smirking, though.

John: Relax, sis. Who's on your mind?

Sophia: Riley.

The name sparks an idea in your mind. You can recall that she is shorter than your little sister and has fiery-orange hair and a nice, perky rear. However, those details and the fact that she's moderately attractive aside, you can't recall anything more significant about the girl. It's no wonder, really - Sophia doesn't have many friends, and you don't see them often.

You shrug to nobody in particular, fingers tapping quickly.

John: Alright, but I still don't see what's in this favor for me?

Sophia: :S

John: I'm kidding.

Sophia: We can do butt stuff.

Your fingers freeze briefly. You clear your throat, having not expected that. However, you regain your wits quickly.

John: Sure. When you're finishing?

Sophia: We already did, I just wanted to give you a heads-up.

Josh: Cool. I'll finish in the next term. Be there then.

Your brunette sister answers with a thumbs-up emoji. Exiting to your home screen, you stare at it briefly before noticing a small notification prompt jump on the screen. It's a notification from your achievement gallery. Opening it, you are immediately taken to an achievement labeled 'Educational Advances 1', granted when Grace submitted to you.

As you collect its rewards, your tokens increase to 40. Smirking to yourself, you close the app and continue on your way.

-Later-

As you exit the classroom, you can barely keep your mind tethered to the lecture it was on about. The reason becomes obvious as Rachel Lithe passes next to you.

She's wearing a very low-cut top of a dark color. Her ripe DD-cup breasts seem to strain it with every wobble and bounce accompanying her steps. Her small, erect nipples are perfectly visible. On her derrerie, she wears a pair of shorts that almost seems baggy on her 34-inch hips. A brief thought of increasing her size crosses your mind, but as you check the app, you only have 1 inch available, and no transformations left - you're literally spent for today. It does seem somewhat strange that you have a singular inch of transformative power at your disposal but you decide not to give it too much a thought.

However, before you manage to take your steps away, you steal one glance at Rachel's actions.

She wastes no time, coming to a nearby guy and immediately flashing her tits at him. Seeing that he barely gave even noticed her, Rachel takes this as an invitation. Vigorously swaying her chest sideways, she knells by the guy, who's talking with his friends over something, and undoes the fly of his pants. Less than five seconds pass before the Lithe girl has the guy's hardening penis in her hands. She strokes it tentatively, gauging its owner's reactions before giving it a lick. Then, she takes it whole in her mouth. Although you don't have X-ray vision, you can use your imagination to imagine Rachel licking and suckling it with fervor, caressing the guy's cock with all she has.

It takes her about a minute to get the guy off. Seemingly sensing his release coming, Rachel pops his dick out of her mouth, letting a long strand of saliva drip onto her tits before he coats her with the white batter. Immediately after that, she cleans off what she can and helps the guy fix his pants before returning her attire to an orderly look and going elsewhere.

As Rachel's presence in the corridor wanes, you clear your throat, feeling your own hard-on lightly press against your underwear. Trying to clear your mind off the luscious image, you strut forth. The mass of students you are a part of soon thins out, everyone going about their business.

Entering the parking lot, you immediately notice a familiar plume of brunette hair standing next to your trusty vehicle.

Sophia's massive rear brushes against the back door as she speaks with a redhead girl around your age. Her skirt does nothing to prevent the contact, and even from the distance, you can see your sister's neck graced with faint red. The girl in front of her, Riley, doesn't seem to care or notice, however.

"Hey there," you announce your presence with a benign smile.

Sophia's head immediately snaps in your direction. Within her eyes, you notice desire lurk just beneath the composed neutrality. She reciprocates the smile and responds shortly. Then, your eyes land on Riley.

Just as you remembered, she has ginger hair that fall to her shoulders in a wavy pattern. Her eyes shimmer faintly, a mix between hazel and deep brown as she studies you in turn.

Her body could use upgrades in just about every aspect. Activating Measurement vision, you immediately notice all the details her body doesn't show from beneath her baggy hoodie and long pants. Her height is a rather petite 5 foot even, and her breasts are hardly classified as B-cup. Her rear is somewhat more pronounced than you remember, a somewhat strong 35 inches somewhat larger than you'd expect on someone this short. However, another thing that pulls your attention is 36 inches in her waist.

'She's could use a couple of inches off her belly.' you note to yourself. Briefly looking at her face, you fail to see significant pudginess on her cheeks. Puffy, yes, but not overly fat. 'That's probably the reason she wears a hoodie right now, too.'

"Hi, I'm John," you say in a friendly tone.

"Ah, yes, I'm Riley," she responds, giving you a faint smile. Her voice is nice and enticing.

"Well, hop in and we can go."

You leave the parking lot quickly. The drive toward the shopping mall is rather short, and you can't help but engage in some casual banter with your sister and her friend. The simple back and forth is nothing significant - just a friendly check-in if you will - and before you know it, you're already driving into the mall's parking lot. Finding a spot, you stop the car.

You turn around, giving Riley a quick look before saying, "It was nice to meet you."

Riley's hair sways gently as she nods. "Thank you, John. See you tomorrow, Sophia," she adds, exiting the vehicle right after.

You hear your sister give her goodbye as well before shuffling in her seat.

Sophia releases a deep breath which extends into a moan. She gives you a sensual look, licking her lips as her bum shuffles in her seat.

"I've missed you," she says with the sweetest yet sultriest voice you've ever heard her speak. Her hand immediately creeps down to your leg, striking your rapidly hardening cock through your pants.

"Me too," you answer. "So, do we need anything from the mall?"

"Mmmm no, I don't think so," she replies softly, slowly leaning in. "But I know what I need right now~."

You reciprocate the act, giving your sister a deep kiss. It lasts for a couple of seconds, Sophia's hand slowly stroking your length as you fight the urge to get her to the back seat and rail her there. However, you **** the moment to stop.

"We should be going home. We can continue there."

Sophia groans as she dislodges from you. You don't need to activate Measurement Vision to know her lust is literally a single thread away from her riding you right here and now. However, your eyes meet, and she only nods. There is a time and place for everything.

...

As you stop the car in your home's driveway, Sophia almost jumps out of her seat. You exit quickly as well, and you manage to catch a glimpse of your sister jiggling her most generous asset in your direction teasingly. You feel your boner raging in your pants as you almost bolt to her. However, you compose yourself just before you both go inside.

As you enter, you're almost immediately welcomed by the sight of Emma leaning on a table. Her tits are resting on the wooden surface, rubbing against it as she moves gently. Though she wears a bright shirt, you can easily see large, dark spots right where her erect nipples tent the material.

"Hi Emma," you announce your presence.

The busty blonde flinches, her phone nearly dropping from her hand. She looks toward you two, and flashes a grin as she responds.

"What's for dinner?" Sophia inquires.

"I ordered chinese," Emma answers. "It should be here in a quarter."

The bottom-heavy brunette scowls. "You could learn to cook for once," she sighs. "Your tits won't get smaller with all that chem in the food."

"You're the one to talk. You still fit in the doorway with that ass?"

Suddenly, the tension in the air dissipates as all three of you laugh. Sophia is the first one to break the charm, excusing herself and saying she needs to wash. She gives you a brief, needy look before disappearing from your sight.

You don't need any further invitation. Almost jumping on the stairs, you throw your bag in your room before Sophia grabs your hand. With but a gentle pull, she guides you toward the bathroom. Her wide hips sway with every step, and you can't help but get a hand on one cheek. A soft gasp escapes her mouth in response, the sultry grin on her face widening as you two enter the tiled room.

You don't even have time to lock the door properly before Sophia is already on your face. Her lips hungrily seek yours, her small hands caressing your body. The still unresolved lust in your veins makes any semblance of control melt away as you claw at Sophia's clothes. The action elicits a short moan that is caught between your tongues.

You dislodge for literally ten seconds, and it was only to get undressed. Sophia wastes not a single moment more, immediately getting on her knees and getting your boner in her hands. She runs her tongue up its edge as she strokes it with fervor. Her eyes look deep into yours, lust and affection evident as she does her best to pleasure you.

You have to brace yourself against the wall to not fall over as she takes her actions up a notch. Obscene slurping sounds resound in the bathroom as your bottom-heavy sister blows you, giving it her all. All the while she does that, she is constantly fingering herself, seeking her own release while providing you with yours.

"Sophia, I'm cumming!" you announce after a short minute. Your orgasm lasts for several seconds, the sum total of your unresolved action with Grace finding its release in your younger sister's waiting mouth.

Sophia greedily gulps down every last drop. As you finish, she slowly ascends your shaft before showing you her empty mouth.

You wobbly walk over to the shower, turning it on. As the falling droplets create their resounding melody, the short brunette is already a step ahead of you. She positions herself in the middle of the shower, presenting her massive ass as much as she can. Water cascades down her back, wettening her hair. She turns back to look at you, and then shakes her derriere invitingly.

You wordlessly comply, stepping closer and sandwiching your cock between the pale masses. Kneading her cheeks, you feel Sophia almost vibrate against you, her ass rippling with every movement. Giving her a light slap, you hear her moan with need.

You drag your penis up and down her crack, slowly positioning it against her pussy. Sophia responds immediately, pushing into you.

"Yes~," she moans with abandon whilst beginning to move. "I needed thisssss..."

You steady your hold and begin matching your movements with your little sister's. This immediately finds purchase in her voicing her pleasure louder. Recognizing the song and dance, you give her a few powerful thrusts, sending ripples across the expanse of her ass.

The warmth of the pouring water from the showerhead is nothing compared to the searing heat of Sophia's insides. With every resounding slap of your push, she inches closer to the wall. With every rapid pull, your hands travel across her body a little more. Within a couple of seconds, you're gently rubbing her small nipples, tweaking them with every thrust.

Sophia's cunt clenches on your shaft. You feel the slickness of her pussy juice travel down your length, staining her inner thighs and joining the water traveling down.

She laughs briefly, letting you slowly exit and turning to face you.

"Oh, I so needed that," the brunette states. Yet, her gaze is still full of the fiery desire.

"Always here for you, little sis," you respond as you push against her. In the hot and wet embrace, you two kiss deeply, the steamy atmosphere of the bathroom adding even more intimacy to the moment.

Sophia's hand strokes your dick for a few seconds before the two of you catch a moment to breathe. Then, she lifts her leg a little, spreading her pussy lips wide.

"One more round before dinner, big brother?" she asks, her tone almost teasing. "Fill me up, will you?" she adds, and you can't help but feel the slight tremble of arousal she emanates at her own words.

You're not the one to turn a girl down. Quickly lining yourself up, you immediately thrust upward with all your strength.

Sophia barely manages to even moan as you spear her completely. Her small tits bounce as you briefly lift her entire body with yours. Her prominent ass rubs against the cold tiles behind her as you exit and repeat the motion, which seems to finally snap her out of the shock.

"Yes, yes, yes," she chants with every move. "Fuck me, John. Give me your cum!" she almost pleads, her gaze full of affection and lust.

You speed up your motions. Sophia moans in tandem, chanting your name like a spell.

You grab her by her ass. Forcefully kneading it with your fingers, you feel your little sister tremble against you. You kiss her whilst thrusting ever deeper inside. You feel her second orgasm hit her, her inner walls massaging and milking you feverishly. You barely last a few more seconds.

You sheath your cock completely in Sophia's needy cunt before you come. You can feel a few powerful shots of cum paint her insides. If her moans are anything to go by, she also is aware of that.

The two of you stay like this for a few extra seconds. Your labored panting is almost completely camouflaged by the sounds of the shower.

Sophia leans in, her lips tenderly meeting your nose before she descends slightly. You return the favor, the two of you kissing deeper as the water runs over you two. Your dick is still deep in your sister as you make out for what feels like hours.

Eventually, with a sigh of satisfaction, you dislodge from your sister. The two of you quickly wash up. You offer Sophia some help, which she eagerly accepts. Using that time, you take your time fondling all her body has to offer, which your little sister accepts with a wide grin on her face. She does her hair before returning the favor to you, making sure your penis is extra clean.

As you turn the water off and grab a towel, you suddenly get a whole new idea. Without saying anything to Sophia, you suddenly hug her from behind, wrapping you both in the towel.

She gently chuckles, giving you an affectionate kiss as you two embrace the moment a little longer.

However, you eventually dislodge properly. The two of you dry yourselves up before donning new clothes. Sophia struggles briefly with putting on her panties and shorts, but her shirt seems too baggy on her frame.

As you finish dressing up, you take your steps toward the bathroom door, which you find partly ajar. Figuring it was just you not managing to close it properly when Sophia came onto you, you make nothing of it.

Walking down the corridor, you can't help but let your hand wander to Sophia's posterior. Squeezing it through the thin shorts, you earn yourself a brief moan which ends in your sister leaning on you. Her head rubs against your shoulder as you descend the stairs to eat.