My sister is a bit naive and doesn't know about incest. I taught her false sex knowledge, and she innocently started touching my cock. I got excited and pretended it was H training, doing bad things with her body. I felt guilty, but she eagerly sought insertion, so we ended up having incest sex! I felt so good that I accidentally came inside her, but she didn't notice and kept pounding in cowgirl position, giving me three non-stop shots. I want her to stay this way, not knowing anything!