Girly Boy/Get out of the shower to jerk properly
From Create Your Own Story
You're now in the bathroom, so you can take your time and have a proper fap! After the shower, you dry up, brush your teeth then, still naked, you sit on the floor, your back against the shower door, legs apart and your erection standing proud between them. Both your hands travel to your crotch, one wrapping around the base of your cock, the other cupping your balls, and you start to jerk it at a medium pace, wanting to enjoy it to the fullest. A minute passes, then two, then three, as you recall sexy images in your mind, and finally you feel the impending orgasm.
You stroke at a furious pace, now near to the goal, and just as you get over the edge, the bathroom door handle moves. It's locked, so they will have to wait, you think: but as you see it open, you realize having forgotten to close it! An instant later, your big sister Kelly walk in, dressed only in her panties, and even if you stopped stroking the only thing you can do is stare at her dumbfounded as your cock twitches hard and let's out a half dozen powerful spurts in the air, landing on the floor three feet away and making a big puddle next to her feet.
She stays still for a second, then bursts into laughter. It's not the first time she caught you masturbating, but she never saw you right in the moment of orgasm! You close your eyes and turn away, but as she finishes laughing she walks to you and gently pats your head. "Hey, nice show!" she teases you. "Nothing that I haven't seen before, but quite impressive. Next time you better remember to lock the door though!" she says, casually heading into the shower like nothing has happened. You get yourself back and stand up, ready to leave. "And clean up your mess, I don't want to step on it!" she yells at you with the water running, while your heavily embarrassed form returns to your room, puts on shorts and a tee and heads down for breakfast.