I've fucking my son for about 6 months and I thought that besides me, he only fucked his girlfriend but I found out he also fucks his half-sister. She lives with her father but some times she spends a few days with me and my son. This was one day I came home early from work, they didn't noticed I was already at home. I just record it and didn't let them know I caught them. That made feel really wet and jealous because he told he left his girlfriend for me.