My wife is an attractive woman. Curvy body, big natural tits. Were married 6 years, she's 40 I'm 44. Her ex boyfriend before me was very extreme with her in sex. Tied her up, pounded her hard, choked her with his cock, etc. We still see him on occasion because we have mutual friends. All is cool socially. I have NEVER EVER had a cuckold experience and NEVER even thought about it. But after knowing how he treated my wife, every time he is present in our circle of friends, all i think about is watching him do these things to her in front of me at that given moment. I have extreme dirty thoughts of him just throwing her down and tying her hands behind her back, stuffing her panties in her mouth and pounding her until she screams. Or bending her over a table, and pulling her hair while he violently fingers her. I have even gone into the bathroom and jerked off to the thought AT THE GATHERINGS! How can i control these thoughts? I feel like a horny 18 year old.