Threesome With Best Friend And His Wife

I am not going to write a big novel about this, just the straight facts, so I was hanging with my buddy and his wife having drinks and the topic of threesomes came up and before I know it I was roped into agreeing to have one with them. I was going to stay the night anyways in their spare room. So we go to do it and we start. It was fine at first but his wife wanted to try DP so lucky for me I get her ass. I have never tried anal so I am excited. We start but after a few minutes, where my buddy is on his back being ridden is getting the spins from drinking and we have to stop as he runs to the ensuite and starts to throw up. So I leave the room and his wife helps him out and I head to the spare room. 20 minutes later or so I a dozing off when a knock is at the door and it is my buddies wife wearing a robe and I ask her how my buddy is doing. She says he is fine, pretty much passed out now but she said he told her that its fine for me and her to finish what we started. I don't really question it, like she is hot and I am still horny so I agree and she had brought lube and a toy with her and she let me use her ass again, I guess she knew how much I wanted it I guess. So we do the deed, maybe because I was drinking but it felt like it went on for a while. She let me finish in her ass and then it was done. The next morning my buddy is hung over and asks how it was after, which was a sigh of relief because he actually did tell his wife to finish with me. My only thing is, that I feel guilty for and I haven't told him is that the sex, well anal with his wife was like, I dunno passionate. A lot of kissing and she had some dirty talk, and after we finished she lid next to me and we kissed for a bit until she went to clean up and go to bed with my buddy. I also just wonder if it was just like how she is with him so to her doing that during and after sex was just second nature. I still feel guilty though, it feels like it went from just sex to more and it should of just been sex.