About a month after my girlfriend and I had a threesome with her dads friend I catch him grabbing her tit's, slapping her ass, and trying to kiss her. She laughs and pushes him off. I'm a small guy and not a fighter. I get jealous but, we had a threeway when I was wasted so, it's my fault. I got home from work and her dad said she was in the garage talking to mike. I walked in and she was wasted sitting on the work bench in her panties making out with him. Her brother and one of his friends got home and walked in too see what we were doing and laughed at her drunk ass. He put his hand in her panties, she pulled his hand away, and said it's her time of the month, she bleeds bad. He kept rubbing her pussy through her panties and then pulled them off her, she giggle, and he pulled her tampon out. My heart was broken and i felt like a pussy. I wanted to stop him so bad but, I was scared of him and she let him do it. He got her down and told her get on her hands and knees so he can hit it from the back. She was on a dirty, full of oil, and everything else concrete floor. He started fucking her without a condom and she didn't even care. Her brother was recording it on his phone. She was bleeding bad and then he sat down and she started riding him. He told her he was coming and she got off. He told her to clean up his cock it was nasty and she did. He's been getting worse and she doesn't know any better she thinks I like it.