Make your big sister beg

You have the three girls stand naked in front of your bed. They move quietly as everyone is afraid of upsetting Mom. You're all adults and afraid of your mother, it's pathetic, but she does have a way of ruining everything when she's offended, and she's offended by everything. It's best just to avoid her ire.

Ellen stands in the middle of the trio. You look their naked bodies over like the horny, spoiled male you are.

"So, you want my cock?" you ask Ellen bluntly.

She glares at you in annoyance. She'd rather not be so blatant about it, but you're not going to let her deny that she wants to have incestuous sex with her brother. She deserves to be humiliated, and humiliating her will make this feel all the better for you anyway. Katy and Heather look gleefully at Ellen, enjoying seeing their tormentor get her comeuppance (before she gets her cumuppance?)

"I guess," Ellen says unenthusiastically, "Why do you have to be so gross about it?"

You laugh. "Gross? You're the one who wants to have ****, Ellen."

She sighs and stick her tongue out at you. This attitude won't do at all!

"You could just leave if you're so bothered by how I'm acting," you say.

She turns to go, and you gesture for Katy and Heather to hold off from stopping her. Of course she's bluffing. She gets to the door, then huffs in annoyance that you didn't try to stop her from storming off dramatically. The dramatic storming off is one of Mom's signature moves, you're not falling for that one.

"Fine," Ellen says, turning back around, her big tits jiggling delightfully. Her nude body being on display for this makes it all even better. "I want to have sex with you. But only because I'm 23 and I've never been laid, and your dick is convenient."

She looks right at said dick. It's still hard from Katy's stroking. Suddenly it annoys you that Ellen won't just say she likes you specifically. It seems like her old better-than-you attitude where your music was crap and hers was great, she had sophisticated taste in books while you were a child who liked comic books. She was the genius, you were the dumb kid brother. Why does she still have to be stuck up?

"There's horny dudes in the street right now who'd love to fuck you," you say coldly, but you feel like she isn't earning better treatment. "I like to have sex with women who actually appreciate me. Katy?"

Your sister grins and says, "I like having sex with you because I love you, master. Would you like to fuck me now?"

Wow, your little sister really laying on the doting submission like never before, but you love the contrast to how Ellen is acting. You ignore your big sister's glare and say, "Yes Katy. Lay down and spread your legs on the bed."

Katy literally has a bounce in her step as she obeys you. Ellen looks horribly offended, of course, but you keep ignoring her. Heather looks amused and hardly minds you having sex with another woman, she's always turned on by kinky brother/sister sex.

Your little sister lays on her back on your bed and spreads her legs, showing you her sexy cheerleader cunt spread open with its beautiful pink folds inside. A month ago you wouldn't have lasted thirty seconds in your sister's tight pussy, but you've gotten a lot of "reps" this summer and think you can avoid cumming long enough for what you have in mind.

You lower yourself over Katy and feel a hand on your cock. It's Heater gripping your shaft and guiding you into your little sister's vagina. Okay, maybe it will be harder to not cum fast than you thought. Heather helps you in to your sister and you feel Katie's pussy walls gripping your unprotected cock. Katy squeals with delight and you groan as you penetrate deep with your first thrust, almost to her cervix. Katy has gotten used to your size by now though and takes it well, stroking your hair as you poke your cock around inside her with a big grin.

"Please!" Ellen says frantically, "Don't ignore me! Don't cum in her!"

You laugh and look at your naked big sister, leaning over the bed with a look of desperation. The fact that she's totally naked with her shaved twat on display only makes this more degrading for her.

"Go on..." you say teasingly as you ram your cock inside your little sister, pressing your head against her super-tight cervix. Katy's eyes go wide but for the first time she's not telling you to stop here.

"I... I need to learn about big cocks," Ellen says, "And I want you to show me, little brother. You might rip me in two, but I want your cock."

It's a start, at least it's not bitchy, but she'll have to do better than that. "I can feel your cervix Katy," you say, "It feels so good!"

"I know!" Katy says, "Nobody's ever touched me there, not even Ellen got to. I think I'm ready for you to go even deeper..."

You look into your little sister's eyes. "Really? Into your womb?"

"Y-yeah," Katy says, "Into my womb."

"You can't put your dick there!" Ellen says, and you all look to her because her volume is way too high with Mom just down the hall.

"Shush!" Heather says. "And he can put his dick wherever he wants, in any of our holes. He is our master and you should never tell him what he can't do!"

"You're the perfect girlfriend," you say out loud to Heather, "And you are too, little sister. Here I come."

Katy smiles with pride. You press against her cervix harder now and she grits her teeth. You feel her most intimate, secret place start to slowly part for your cock. With Heather this was easier, but it hardly bothers you that your sister is especially tight. You press deeper, feeling her cervix stubbornly part and pressing hard around your cockhead now. Katy presses her hand against your chest, not to stop you though, she just wants to touch you intimately while you touch her very intimately. You know this hurts her, but there is more pleasure than pain on her face as you **** her cervix open.

You press deeper and feel her cervix finally surrender. You slide a final inch and are inside your little sister's womb.

"No way," Ellen says, and you realize she's crawled down to look up close as you bottom out fully inside Katy. Your big sister knows how deep you are because her eyes are inches away. "How can you be that deep? Katy are you okay? Is he killing you?"

Katy laughs and says, "Calm down! I can take my brother's cock in my womb, Ellen. I'm a real woman. Can you say the same?"

Ellen huffs in exasperation. You lean in and kiss Katy on the lips. She shakes under you from the intensity of having her womb penetrated, then you feel her pussy spasming. She's having an unfakeable orgasm, her body shaking as she cums. She starts to scream and Heather puts her hand over your little sister's mouth to muffle the sound. Katy looks at you wildly as she has a powerful orgasm and her whole body shakes the whole bed, there's so much risk of noise that even Ellen is holding her down now.

Your sister's thrashing body and spasming cervix are too much for any man to resist. "I'm cumming in your womb!" you say, feeling your cock explode deep inside her. You pull out abruptly, and your cock shoots a massive rope of sperm from Katy's shaved pubic mound to her tits. Your cock is shooting cum like a firehose, it's quite the spectacle, and the girls all love it. Heather leans in to take a shot of cum on her face, then another in her mouth.

Ellen is watching your dick fire cum out and she is absolutely hypnozied. You turn to your big sister and shoot a rope of cum on her big tits. "Open your mouth!" you order her as loudly as you dare. Ellen doesn't hesitate to open her mouth wide and you shoot the last of your sperm into your big sister's mouth. Ellen swallows, tasting her brother's sperm. You can tell form the look in her eyes that she loves it.

You collapse on the bed next to Katy, who is still shaking slightly from her orgasm. Ellen stands over the bed, looking at your softening cock.

"Thanks a lot Katy, I wanted his hard cock tonight," she says sarcastically, "Now I'm gonna have to wait even longer."

Heather lays next to you on the bed. "Silly girl," she says, "He can get hard more than once in a night, you know..."

Ellen gasps, but a smile cross her lips.

You lay between Heather and Katy as Ellen stands over the bed and looks at your cock, as transfixed as ever. But now her attitude is different. No bitchy comments. No entitled, holier-than-thou attitude. You lay there with your women for a while, catching your breath and enjoying letting your hedonistic evening's relaxing pace. Ellen looks like she's trying to find the right words to say.

"Please tell me what to do so I can play with your cock," Ellen says eventually, "I want to be one of your girlfriends, like Heather and Katy."

You grin. "Now you're getting the right attitude," you say, "But Katy wanted to see you really **** yourself. Have you seen enough of Ellen humiliating herself yet?"

"Not even close!" Katy says. It's late at night by now but you all seem to be full of energy.

Rather than look daggers at her sister, Ellen smiles softly. "Please tell me what I can do to **** myself and please you," she says, "If I debase myself enough, then I might be worthy of your cock". You know she's playing the role of the submissive, saying what you want to hear... but she's saying it so breathlessly and enthusiastically, she's totally into this. She is a woman transformed. Still, you've spent the better part of the night making it happen, and several days laying the groundwork. Maybe all summer laying the groundwork, if you think about it. You've brought her to this point, she's ready to do anything.

Now it's time to enjoy the fruits of your labor.

Really not trying to drag this out unnecessarily, I just thought this pace was nice. And I'm up to the breakneck speed of a chapter in a single day, haha. I think I'll do multiple options for various tastes here, as suggested.