I have developed a massive fantasy over the last couple of years about double teaming my long term girlfriend with a well hung buddy of mine at uni. I've told her about it but she is lukewarm about the idea, but I know my buddy would be game for it. My girlfriend is pretty open minded about group sex as she has done a threesome before, but says she only wants to do group sex when single. Are there any other guys that get off seeing/ imagining a hung stud fucking the shit out of their other half? If so, and you have been in a similar situation, what did you do to convince your girl to go through with it?