Hot Summer Job/Larissa watching you in the doorway
At first you see your sister Bree standing in front of you. You have to blink a few times before you register where you are and who this is. Little Larissa stands before you open-mouthed, a mixed look of disgust, amazement and confusion stuck on her face. But... you didn't hear her at all. Did you leave the door open? How long has sh-
"KYLIE!"
Her scream sends a bolt of 'what-the-fuck-are-you-doing' coursing through your body. You reach down for your pants which have fallen past your knees. You're still floating a semi and, despite her scream, Larissa continues to look on while you nervously fumble with your pants.
"What? What's wro-what the fuck?"
Kylie is already next to Larissa. The two of them watch as you freeze up trying to stuff your dick into pants that for some reason refuse to pull up your legs. But the reason you freeze up is Kylie's fault. She's still completely naked.
She steps behind the door frame as soon as she can stop staring long enough to notice what it is you are staring at. But she doesn't hide from view completely. You get a thin sliver of one side of the tight redhead's body peeking past the frame as she continues to stare at you. It seems that she's just as interested in you as you are of her, although perhaps not for the same reason.
"I-I'm sorry," you mutter. The girls don't reply. They're too busy watching your cock reinflate in your hand.
"What's he doing here?"
"I think he was masturbating," answers Larissa.
"No! Why is he here?!" repeats Kylie.
"Oh. He's the babysitter."
"Well wh... did he see me naked?!"
Larissa pauses, looking away from you just long enough to glance up and down her sister's frame. "...now, or before?"
"Thanks a lot Rissa!" she whines, poking her little sister who can only grin. "Why did you scream?"
"I thought you'd wanna see."
By now you've managed to wrestle your erection back into your pants, but it's certainly awkward having two sisters inspect you as you fumble with yourself like this, despite their interest.