What was your most embarrassing sexual moment?

shortly after my first time having sex, my bf and i were hooked, and would fuck whenever we could. one day we jumped in his car at lunch (in high school at the time, for anyone who isn't aware) and went to my house, so we could be alone and fuck instead of eat before heading back to class. or maybe not head back to class and just fuck all afternoon.
anyway, we get to my place and start making out immediately. we get to the dining room, tossing off clothes the whole way. he sits on a chair and i climb on top of him, eager to get his cock inside me. i start riding him, making lots of noise. he grabbing my ass and my tits and my neck, kissing me all over. i lean back, eyes closed as his hands slide all over me. when i open my eyes, i notice my little brother (who would've been around 13 at the time) standing in the doorway, watching us. i have no idea how long he'd been there. apparantly, he wasn't feeling well and stayed home from school. he was resting in his room when he heard noises and came down to see what was going on.
needless to say, there was lots of yelling and scrambling for clothes and threats to not say anything to our parents. to be honest though, it wasn't long before i realized that part of me was kinda turned on by the whole thing. i didn't notice at the time, but i suddenly found myself quite sure that he was hard and maybe even rubbing himself as he watched us. again, not sure about the truth, but i became convinced that he was watching us from the beginning, wanting to join in.
but at the time, i was furious and embarrassed and all that.

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