I have a 17 y/o sister who I am very very close to. Its like living with my best friend, well she started seeing this guy that I work with, they met while she was waiting for me to get off work. The guy is 18. I've known the guy for about a year and well I knew the guy to not date much and kind of just linger with a girl here and a girl there. He wasn't much of a whore, so it would seem, he would date a girl for a couple of months and something would happen and they would split, nothing out of the ordinary... well...my sis and he started to talk. they talk all of the time and well like I said my sis and I are really close, so she is really open to me and knows that she can trust me. This guy has started sending her pictures of his penis and continues to tell her how he wants to touch her and all this. Think the worst, and that is what he's writing... My sis trusts me so much that she showed me some of the text, cause I doubted he would say the things that she suggested. My sis is not really that used to so much open vulgarity and perversion, but since this she says she likes it. I don't know what to do. I want to cut his dick off and feed it to his left eye after I stab him with a broken broom and watch him cry out for mercy... I feel like she is only going to get hurt now and I have told her so, but she likes the sexual attention and refuses to heed my warning. Legally he is sexually harrassing a minor. I don't know... any advice? any cents to add to my knowledge fund??