A Penny Drops

There's an eternity of silence between her question and the strange, guttural noise tht is your answer. Penny rolls her eyes at it, gaze flicking down to your crotch. "Is it hard right now?" Penny shuts off the tap and steps down from the sink, turning to face you. A thin undergrowth of bright red hair leads the way down to a pussy so pale it gleams in the glare of the kitchen light. Penny's vulva is studded with yet more freckles, and a small part of you is pleased you were right about that, during your frequent attempts at imagining what she might look like naked. She moves closer, twisting a lock of her ginger curls around her index finger. "Makes sense, I suppose. Can't even think straight, I'll bet, all that blood rushing down to it. Driving you crazy, isn't it? Do you want to slip away so you can touch it again, maybe while you think of me?" She strokes her landing strip provocatively. "I guess it's true what they say; you can never trust boys, all because of their willies. You see a pretty girl and all you ever think about is touching it, or sticking it in her, or making her suck on it like a nice, long ice lolly. Do you want to do that to me? Do you want me to suck on it until I get to the creamy centre? Do you want to see it all over my face, in my hair, maybe even...up my butt? Betcha do." She grins impishly, putting both arms behind her back and gripping the left with the hand of the right, playfully rotating her upper body back and forth as she regards you. "Betcha touch it and think about me all the time. Betcha wanna touch it right now, until you've redecorated the inside of your undies. What'll Mummy say, hm? She still does your laundry, right? What'll you tell her when she asks about the big white stains all in your pants? Will you tell her your sister and her BFFs got naked and you just had to jack off to them until it went everywhere, and you made a big old mess in your boxers for her to clean up?" Before you can process what she's doing, she's undoing the buttons on your trousers and pulling them down. "Bet it wouldn't even take much, would it? I see the way you're looking at me, the way you've always looked at me. You want to fuck me...or maybe you want me to fuck you?"
A loud gulp is your only reply. Penny takes off her gloves and the room is momentarily filled with the sound of squeaking rubber, before she lets them drop to the floor. With you still decidedly intimidated by both her presence and her unexpected nudity, she takes the opportunity to slide the aforementioned boxers down to your calves, revealing your cock.

As if sensing her presence, it winds upwards, hardening into a not-insignificant pillar. Penny titters at it, her eyes wide, pupils dilated. She moves her face closer still, to the point that you can feel the steady, warm puffs of her breath on its half-exposed head. It's driving you crazy, you're paralysed by a sickly mixture of lurching embarrassment at the sheer intimacy you're experiencing with one of your sister's best friends and your desire for her to touch her tongue to your throbbing prick, and more besides. The tension builds and builds, and right when you're sure she's going to start heartily sucking you off, she settles onto her knees, shuffles slightly forward, and plants the tiniest kiss on the very tip, staring directly up at you with huge doe eyes. Immediately, your cock spasms and you find yourself drawing your knees inward in a bid to control it. While you're trying to prevent that meltdown, Penny quickly grips the waistband of your boxers, slides them back up onto your waist and negotiates your cock back inside them. You silently chastise yourself, you can't bust now, not after so little, not like this, not in front of Penny...but it's still sensitive from your session in the bathroom, and you're becoming less and less sure you can stop it. The thought of it makes your cheeks run hot; you try to stop it from happening, but Penny does that high giggle of hers, and that pushes you over the edge. A load of cum shoots, strong and quick, out into your boxers, and you stand before her, your face a mask of humiliation as the reality of what you've just done sinks in. You take a shuddering gasp, Penny looks at you with such amusement. "Oh, dear," She remarks. "Seems like somebody got a little too excited and came in his undies. So strange," she interlaces her fingers and puts them behind her back, then leans forward as if trying to inspect your boxers, her breasts droop the slightest bit, their puffy, ghostly nipples pointing to the floor. "All I did was give it a little kiss, barely even touched it really, and..." she makes a wet pop with her mouth.
"I—I'm sorry," You reply, dumbly; the gooey film you've deposited into your boxers slathers itself onto the head and shaft of your cock, a note of disgust and renewed embarrassment makes you shudder. Every guy's worst nightmare, surely, creaming yourself at a girl's first touch. "Why are you sorry?" Penny blinks. "You're cute when you're embarrassed; ironic, really, since you spend so much time watching and reading all that ENF porn. Though if I were you, I'd take them off before I make a mess inside them next time, I always take my panties off when I'm...y'know, leaves less to clean up."
"Don't be too harsh, Pen." You hear Christie's voice from behind you. Turning, you see the nude blonde sauntering in, tits bouncing nicely with every step. She runs a hand along your right shoulder blade, then reaches down and pulls your waistband out to inspect the wad of semen you stained your boxers with. "That's a lot," she breathes. "Must have some big balls on him."
"Oh, he does. Believe me."
"Look at his face!"
"He doesn't see naked girls very often, does he?"
"Not in real life, at least."
"Do you think he likes what he sees?"
"Definitely, look at his face!
You're finding it almost impossible to keep any semblance of composure as they go to stand next to one another in front of you, the blonde and the redhead, one busty one perky. You're vividly aware of the stickiness in your pants, and can scarcely see how things could possibly get any worse...and then you hear another set of footsteps in the hallway behind you. "You been behaving yourself in front of my friends?" It says, and from the first syllable you instinctively cringe at the sound of your sister's voice.

[Author's Note: I always enjoy and appreciate feedback in terms of what's working and what isn't, so please feel free to like and/or leave comments!]