Prefacing this with the fact that my wife and I have never done anything like this before and this is very new for both of us but we are having fun so far.

Ever since our couples vacation 2 months where my wife and I went to Cancun with my best friend and his girlfriend where my wife told me that she and my friend sort of flirted with each other while we were all too drunk, we've been very turned on by the idea of sharing her with him.

We had him over a few weeks ago and the 3 of us drank and my wife showed her tits and played games with us while grinding on both of us. He was very cautious to make sure he wasn't offending me.

Last week he came over and my wife sucked his cock in front of me. (We talked about it being okay for her to do that before he came over). After a few drinks, she made out with him and got on her knees and sucked his cock. I found it so incredibly hot. The woman I love enjoying being a slut for my friend's cock.

We've been having the most amazing, mind-blowing sex since all this started. She's cumming on my cock even more than she did before.

She admits she likes it and wants to keep going. How do I know when to stop this before it goes too far? Is there a too far if its bringing us closer and we love it?