It shouldn't have happened, but I fucked my sister.

The brother and sister were lying on the bed talking when suddenly the girl lifted her T-shirt and showed her brother that she wasn't wearing any panties. Then the girl started stroking her brother's groin, where his penis was visible. Feeling his erection, the girl took out his penis and started sucking it. After giving her brother a blowjob, she climbed on top of him and started fucking him in the cowgirl position!