Exhibitionist Boy
You were 12 years old and utterly overwhelmed by the intense hormonal changes of adolescence. All day every day, all you could think about was girls, hot girls, tits, asses, legs, lips, being naked and jerking off.
You weren't the coolest kid in school but you weren't a total loser either. Still, not cool enough to get very close to any girls. Instead, you'd spend all day in class checking them out across the table or across the room, staring at their soft flesh when you thought no one was looking, wishing for a lucky peek down a loose-fitting bra or up a briefly disheveled skirt.
When you'd get home at the end of a school day, you'd hurry up to your room to strip off your clothes and masturbate, maybe to a hot glimpse you'd caught that day, maybe to a particular girl you fancied at the time, maybe to whatever fantasy happened to pop into in your head. Perhaps you had some budding bisexual tendencies as well-- not necessarily directed to any particular boys you knew, as that was still a bit too weird-- but certainly there was a special type of sexual attraction directed towards your own developing body. Oftentimes you'd watch yourself in the full length mirrors of your closet doors, teasing yourself, dancing or gyrating lewdly and enjoying the sight of your boner bobbing up and down or waving from side to side. You'd turn around and bend over to spread the cheeks of your sexy little bubble butt, winking your perverted ass hole with excitement.
You loved your sexy young body, your smooth, nearly hairless skin (with only a small patch of pubic hairs above your penis and under each armpit), your attractive boyish figure, the way your hips would wind and pump involuntarily with your growing arousal. You loved to watch your penis grow from small and soft to long and hard, from long and hard to longer and harder, from longer and harder to throbbing, hot and pink as you carefuly stroked it lying on your bed, standing/stitting/lying on the carpet or standing/sitting/kneeling in front of the mirror for a close-up view.
You loved to imagine yourself masturbating like this before an audience, perhaps a girl from school or from the neighborhood sitting at the foot of your bed or standing beside you and looking on, or even a crowd of familiar faces and/or strangers observing with lewd cheers, hoots and hollers from the other side of the mirror. You'd perform for them, your imaginary voyeur(s), running your hands up and down your whole body, over your sensitive pink nipples and soft ass cheeks, spreading your legs wide, presenting your hot throbbing cock to their view as clearly as possible, shaking and slapping and bouncing it for their entertainment. You'd imagine their gazes transfixed on your body, especially your penis, impressed with its above-average length for your age (5 inches last time you'd measured). And eventually, finally, after delaying it for as long as you could to make the pleasure last as long as possible, you'd watch the thick white squirts of cum shooting out of your dick hole as you reached an intense, incredibly satisfying preteen orgasm, dreaming that someone, or a group of someones, were watching in thrilled astonishment along with you.
Something like this is just what you were doing one Friday afternoon after school in your bedroom when fate came knocking at your door, literally. You were lost in your own pleasure, laying on your bed fully naked, your clothes having been carelessly thrown in a heap on the floor in the corner of the room, writhing sensually as you rapidly stroked your very hard cock with a rhythmic fap-fap-fap-fapping noise each time the side of your fist struck its base. At that moment you heard a quick "knock-knock-knock" on the door and were startled from your reverie, eyes darting from the throbbing pink head of your erection to the door, to the doorknob.
Did you remember to lock the door?