I'm 18, he's 38. I'm 130 pounds, he's 350+. It gets weirder. His wife, my ex babysitter and my older sister's best friend, is who I'm living with. She's 28. They're pretty much in an open relationship, he talks to her about him going and having sex with other women, and he tells her she can do the same. But because of meds she's got an extremely low libido and they haven't had sex in over a year. At first I took me and him hooking up as a way for him to "get his rocks off", but he actually asked me to be his girlfriend and that's what he calls me. His wife obviously knows nothing, she goes to bed at 9 so after that we fool around and usually have sex.