"I need to fuck your ass again!"
And with that declaration Sarah pounces on you, tearing at your clothes while humping her towering dick on your stomach hard enough to hurt. You quickly begin helping her to get your clothes off, partially so that she doesn't destroy them (it is too late for your shirt, but your boxers are still salvageable), and partially out of anticipation about what is going to happen next. Your ass is still as sore as before, but now the ache feels almost hungry. The sudden need to have her inside you is almost enough to make you weak at the knees.
That problem is quickly solved though as the thin barrier between her dick and you is discarded and she immediately thrusts up, going past your soft hole and halfway up your anal tube in a single jarring thrust that actually takes you a few inches off the ground. Before you can even begin to gasp, she has grabbed your hips and pushed down, driving herself entirely inside you and making it so that the only thing holding you up is her strong grip.
"S-Sarah!" you manage to gasp out, but she isn't listening. With a look half lust half concentration, she begins to piston in and out of you like a woman possessed. Your hard dick flops around every which way, and your legs seem to imitate, so hard and fast is this fucking. You have half a second to wonder how she isn't tearing a hole in your intestines before she suddenly stops and twists you in midair. You find your face hitting soft cloth, and realize you are now face down on your bed, with your legs hanging off the side. She's going doggy style on you now!
"Dougy, Dougy, Dougy!" Apparently the new position was to her liking as she sped up, chanting your name like a mantra. If you didn't appreciate the strength she somehow gained during sex before, you sure as hell did now as each movement made the entire bed shake and mattress springs groan. Your mind is a mess of pain and pleasure, and although a part of you wants to complain about the rough treatment and voice your concerns over the rest of the family hearing you go at it, the rest of you...
"More, Sarah! More!" you moaned out through a mouthful of sheets, your hips trying weakly to return her thrusts so to help her go even deeper. Our of the corner of your eye you see Sarah drooling a little at your display and feel her immediately respond by shoving herself as far as she can go.
"Dougy, I love you!" she moaned out, and with her dick still completely sheathed within you she began cumming. Warmth spreads through your bowels as her flood of girlspunk tries to inflate you like a pregnant woman, only to fail as your softened pucker easily lets it spray out of the sides. Even so, the feeling is exquisite, finally pushing you off the edge and causing your own orgasm. Its flow of semen joins the much thicker one now running down your thighs and onto the floor. All throughout she doesn't stop humping you, letting out a fresh wave of jizz with each tiny jerk of her body.
Finally, after what seems like a full minute, she stops and slumps atop of you. Having finished much earlier and thus having recovered your strength faster, you manage to lift both of you completely onto the bed. It is a little more awkward (and somewhat disappointing, to your embarrassment) to remove her softened girlcock from your body, but you manage it. It is only when both of you are lying down next to each other that she finally regains her bearings enough to meet your eyes.
"Umm..." Surprisingly, given how she took your last ass fucking in stride, this time she seems to be completely unable to say anything. She opens her mouth a couple of times, but ends up just blushing and looking down. It seems despite how tiring that short bout was, you're going to have to take over here.
"Sarah, you don't have to be so tense. I'm not angry, just surprised," you say, somehow easily switching to a firm brotherly tone that seems to make your little sister calm down somewhat. While today's events had clearly shown her to be the more aggressive one during sex, you still had years of being an older brother to rely on. And right now, you needed that experience to figure out what brought about that pleasurable little stunt.
"I don't know enough about how a girl is supposed to act with a guy," you continue soothingly, "but even I know that what just happened was really strange. Wanna talk about it?"
After digesting your words for a bit, she looks up to you with a confused look in her eyes. "... Actually, I don't really know big brother. I-I was just in my room trying to sleep when I started thinking about what we did. And then after that..." Her small body shivers, and you can see her dick twitch slightly but not rise. "I was just feeling so hot, and my dick got really hard. I couldn't make it go down no matter how much I jerked it, and I started to get scared! It was so painful too, but even then it just wouldn't...! And then I-"
Seeing her start to get worked up, you reach up and caress her head. "Shh, calm down. Don't worry about it, okay? I'm just glad I was able to help you this time." You give her a wide smile to show her that there was no harm done, though your abused behind burns in protest. "Even if I'm only helping you masturbate with my ass as a cocksleeve, I don't mind if it helps you."
Sarah is visibly relived by your words, but inexplicably pouts and murmurs something under her breath. You tilt your head in confusion.
"What was that?"
"Your ass isn't a cocksleeve," she murmurs again, this time barely within the edge of hearing. "Sorry, big brother. I just didn't know how else to treat you yet. It's not often that there's a straight man around, I guess." You cannot help but smile at her embarrassed words, and instead of responding you kiss her forehead and pull the sheet over the two of you. Luckily the mess you both made was on the side, so the sheets are relatively clean.
"Let's get to sleep, alright? We'll figure out the rest tomorrow." Your little sister just smiles widely and gives a cute yawn. She snuggles into your side with a happy noise, and your exhaustion finally catches up to you.
The next morning...
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