Brittney pleasing herself.

Brittney lets out another soft moan, almost identical to the one that drew your eyes up, but with a little more urgency. You are rooted to the spot unable to speak or move. You can do nothing other than watch helplessly as you see Brittney leaning up against the shower wall with her legs spread wide below her. In her hand is the bristled head of a hair brush which she is using the handle to slide frantically between the lips of her shaven bald pussy. Her eyes are shut in the pure ecstasy of the moment, so for now you haven't been noticed.

Your pulse is racing. The combination of stumbling upon your step-sister masturbating and the fact that you've masturbated twice this morning with out cumming yet has set the blood rushing through your veins and straight to your penis. Your cock is bulging dangerously in your pants as Brittney nears orgasm from her touches in front of you. Her moans are coming louder and more frequently but it is when she groans out "Oww Dan," that you almost cream in your underwear right where you stand.

"Brittney!" you burst out in shock at having your sis call your name while pleasuring herself.

Her eyes go wide and she freezes everything she is doing as she sees you in front of her for the first time. Her cheeks, already flushed with arousal, turn an even deeper red with embarrassment. Its then that you receive your third huge shock in the space of the last few minutes. Something about having been caught by you has pushed Brittney over the edge. Even without moving the hair brush since you called out, Brittney starts to climax before your very eyes. Her taunt stomach twitches in convulsions as she bucks her pelvis towards you and the hair brush. A loud wailing noise sound involuntarily escapes from her mouth in between frantic gasps for breath.

Brittney continues like this for almost a minute before she collapses forward onto her knees. She rests one hand up against the glass door of the shower to keep herself from falling completely onto the floor. She slides the stick handle of the hair brush from between her puffy red lips with a small whimpering sound. Her breath is ragged and short, not unlike your own. You swear the slightest stimulation and you would spontaneously orgasm like Brittney just did. You watch the naked form of your sister on all fours waiting for her to say something. You are both late for school now anyway so that won't matter anymore.