Fuck my wife

I get to watch my gf suck and fuck pretty regularly. She craves a big dick once in a while. We have 3 guys we call on when she's in that mode. One of them has a thick 9 inch. Watching her with him isn't like watching her with other guys. She gets animalistic with him. He makes her eyes roll back. Watching her lose herself in the sex is amazing.

How old are you both?

Best thing to do is get her drunk regularly, when going out. Go to fabswingers and arrange for another guy to meet you at a bar one of those nights. Get her wasted, then have the "random stranger" chat her up and help you get her in the car, take him to your house. She will offer little resistance when he gets his cock out. Even better, get her blackout drunk and watch her getting pounded guilt free

Just tell her what you want her to do.