As she begins to bend over, you get a good eyeful of her perky butt. Somehow, it looks even more beautiful then when you were washing it. The shining firm cheeks command your attention, reminding you of how utterly soft they were in your hands. Your eyes naturally fall lower to her hairless mound, and you can't help but notice its shiny lips seemingly throbbing in time with the large girlcock below it. There was a definite wetness there that does not look to be from the bath, much like the wetness that is hanging on the very tip of her urethra.
It is too much. The clashing sight between the forbidden looks of her childlike body and the 10-inch swinging meatpole stimulate you in ways you never thought possible, and before you realize what you're doing you're already on your knees behind her, holding her ass in your hands and rubbing your newly hardened member in between her cheeks.
"Ah!" she cries in surprise, bringing you back to your senses. But before you can take your hands off and apologize, she turns around and jumps at you, causing you to lose your balance and fall out of the tub and on your back. You are barely saved from a concussion thanks to the rug. Looking down, Sarah is smiling and laughing with joy.
"You really are a Straight Man, Doug!" Sarah says with happiness and relief in her voice, her body pressing up against you as her arms seem determined to hug the life out of you. "I always knew you would be! There's no way my big bro would be pathetic like all those other boys!" Her eyes drop down as she seems to realize something, and she pushes herself up until she is straddling you cowgirl style. She fidgets a bit, tiny blush appearing on her cheeks. "Ah, well... Sorry for having doubted you..."
"B-But what about the test?" You say, trying not to think too much about how soft her body feels on you. You don't want to cum quickly again and ruin what appears to be your somewhat restored image.
"Silly, that WAS the test," she giggles, then begins slowly moving her hips back and forth, letting your dick rub along her wet pussy lips while her quickly hardening girlcock rubs against your stomach and chest. "A boi would have only looked at my ass and stood there, not even getting hard. Just like all the boys in my class did during the demonstration. But you actually got hard again, and even made a move. You're amazing Doug." She's looking at you with wide glittering eyes, and an adoring smile. A bit of the cum you shot at her face drips down onto her lips, and she just sticks out her tongue cutely and takes it in with a hum of satisfaction. Your already aching member jumps at the sight, and by the look on her face it seems that she's aware of it.
"Looks like you're all set." Sarah picks herself up a little and turns herself around, getting on all fours atop of you. You can't see anything beyond her member, but it doesn't take a genius to figure out what she's doing when you feel the pleasurable tingle of a tongue run up your dick.
"This time, let me really make it up to you." With that she takes you all the way inside her mouth and starts bobbing up and down. The pleasure nearly makes you lose what little control you have, but you barely manage to hold back. She just barely started, it would be way too embarrassing if you came right away, after all she said. You can't let her opinion of you change for the worse again!
Looking for something to distract you from the amazing sensations, you get smacked in the face with her dick. She's sucking you so enthusiastically now that her entire body is moving along, making her dick swing around flinging precum everywhere. Your mouth feels incredibly dry and empty at the sight, and you decide to kill two birds with one stone.
Sarah let's out a surprised shout, nearly letting your dick out of her mouth, as you instantly manage to take a quarter of her dick down your throat during one of its swings. Unlike last time which was too sudden and thus incredibly painful, this time her dick slides in effortlessly, letting you enjoy the feeling of her throbbing meat inside your mouth. Sarah is unable to restrain herself and starts humping your mouth, pushing the last of six or so of her size in and out again at an amazing pace. All the while she is sucking at your smaller manhood like crazy, even adding little nibbles here and there that nearly border on painful. You feel grateful for them though, as they manage to push your own orgasm a little further back while you focus on pleasuring your adorable little sister.
That all goes out the window however, when she takes her fingers and begins to piston them in and out of your ass. You moan through her dick, and you know that it won't be long now before you are spent. You are already sucking with all your might, and your hands are greedily grasping at your sister's young ass. You manage to get a finger into her ass and another into her pussy. Without a second thought you plunge your fingers in.
The effects are instantaneous, and not a second too soon. Just as your cum shoots itself deeply into your sister's mouth a huge flood deposits itself directly inside your stomach. It goes on for far longer than the previous two times she came, stopping only when your stomach feels mere spoonfuls away from bursting.
"Oh Doug," Sarah says at last, drawing her softening dick out of your mouth as she slowly savors your much smaller wad. "My teacher was right. Doing it with a Straight Man is so much more satisfying." Her eyes are still unfocused, but she definitely looks as satisfied as she sounds. You can't help but feel a swell of pride at being so good at pleasuring girlcock, especially since it is your cute sister's. You can't imagine a better person to have lost your oral and anal virginity to.
Perhaps sensing your thoughts, she turns to you, blushes, and opens her mouth to say something when you hear a sound downstairs.
"Kids! I'm home!"
"Shit, its mom. We should get out of here," you say as you get to your feet reluctantly. Your sister looks somewhat disappointed, but she soon nods and begins helping you cover up the evidence. In short order you both of you manage to clean up everything and head on out of the bathroom. You are unable to eat dinner later due to your belly full of cum, but manage to play it off by saying you had some delicious takeout before everyone else got home, and couldn't keep yourself from eating it all. Out of the corner of your eye, you see your sister trying not to laugh, though she is quiet for most of dinner afterwards. She just picks at her food, a thoughtful look on her face.
One more discreet shower and a whole lot of homework later, you fall on to your bed exhausted. You ass still aches, but it is a rather nice feeling instead of irritating. You fall asleep quickly, dreaming of Sara's lovely bubble butt and delicious cock.
You awaken hours later to a faint knocking on your door. You groggily open the door, but wake up quickly as Sarah drops down onto your chest. She isn't wearing much. Her thin nighties are nearly completely transparent, and her b-cup breasts and string panties are easy to see. You don't truly enjoy the sight though, as your sister looks like she's done a marathon. Her face is flushed, her breathing hard, and her entire body drenched in sweat and what appears to be cum.
"Sarah, what's wrong? What happened?"
It is then that you notice her penis at full mast is rubbing quickly against your leg, as if looking for an entrance it can't find. When she turns to look up at you, you can see her eyes are glazed with lust.
"Dougy, I can't make it go down. I've rubbed it and rubbed it, but it keeps coming back up." Even as she pants this out, she continues to rub herself against you with quickly increasing force. You are reminded quickly of how strong she was earlier. "I-I don't think my hands and a magazine are enough anymore."
"S-Sarah, just-" She cuts you off, going on her tip toes to seal your mouth with hers. After a very quick exchange of saliva that leaves you incredibly dizzy, she pulls back again.
"Please Dougy, I..."
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