We, my brother and I are close in ways Mom couldn't quite imagine. First, we're more than just siblings, we're confidants, best friends, and secondly... yeah, we have sex. It's not such a big deal, the fact that we're indeed brother and sister doesn't change anything, we do not care about ethics or what people might say. If we go to a new place we usually like to pretend that we're boyfriend and girlfriend, that's our game, fooling people like this. We also like to live on the edge, we have sex even if Mom's home. She couldn't possibly imagine us having sex, so she probably thinks we play multiplayer games together all those hours when my door stays locked! Hehe... This time I was playing with my brother's huge cock, rubbing it, making it hard and Mom was wandering around outside, in the hallway during all this. We love adrenaline and taboo things so this was like an extreme sex experience for us! I was jacking him off, faster and faster every minute while Mom's heels were perfectly audible from the hall, she even knocked on the door a few times (vigorously!), scaring the out of us! I did not stop rubbing, I put his dick between my boobs and offered him a wonderful TitJob, not forgetting how much he likes my tits. Because he likes them so much I made sure I always do something with them: playing, rubbing between, placing the cock against the bigger tit, bouncing, or just simply pinching my nipples. He was about to cum, but I decided to postpone it a bit, just to play some more with him and edge the orgasm. I also wanted to find out how much patience will Mom have before coming barging in on us! It was so fun, she knocks the door and yells "what the hell are you two doing in there?" the very same moment my brother cums all over my big tits! Fucking Intense