So a while back I had gotten some lessons for my girlfriend and I with a personal trainer because we are very into fitness/weight lifting. Things hit off good at the start as he was helping both of us on the weekends and on my wife on Tuesday/thursdays while I was at work. He happens to be black and since I’ve never caught my girlfriend looking at interracial porn and she has never brought it up in conversation I figured nothing of it. Lo and behold she comes up to me and wants us to have a threesome with him. I thought to myself well hey I’d rather have her ask me about it then just go ahead and do it regardless. We ended up agreeing and I actually had a great time sharing her with him. Since we were still paying him to train us we didn’t continuously do it every weekend but occasionally I would have him stay after our Sunday workout to have some late night fun. Fast forward, it has been a little while since we had a threesome with him and I had forgotten about arranging it. I was looking for the remote for our TV and thought maybe it was in her nightstand drawer and when I opened it I saw birth control pills and those morning after pills and didn’t really think much of it in the moment. One day I came home for lunch around the same time our trainer was over on Tuesday for my girlfriend and I walk into the house and just hear them moaning coming from the den area and I creep around to see what’s happening. She was letting our trainer go to absolute town on her. She had never done anal with me and I’m there watching this guy (that I let have sex with my wife together) go essentially balls deep with his huge bbc in her ass. I was oddly turned on and watched them to see not only what my gf was capable of doing but how she acted without me there. Never in my life did I think my girlfriend could do stuff like this. She let him cum inside her and was begging for it which all made sense because of the birth control pills I found. I had left the house that day without confronting her because now I was curious if she wasn’t trying to cuckold me or exactly what her plans were I guess. I decided to talk to her a few days later and asked if she ever fucks our trainer other than when we occasionally have him for a threesome and she said “only like once, every other time has been with you”. And then I asked her about the birth control and stuff and she was like “well I was thinking next time he and you can cum inside me” and I was just playing along at this point and said sure. I come home for lunch about 2 weeks after we had that talk and now what I saw was concerning and that’s why I’m here lol. I walk in quietly again and hear the moaning but this time from the bedroom and when I peep my head around the corner I see two random black guys stuffing her and my trainer holding her hair while she’s sucking him off. I had never seen these two guys before and assumed they were our trainers friends but to see them both inside my gf like that was a rush of emotions to say the least. I didn’t stay and watch as I was just in sheer shock and needed to clear my head. Never thought she could physically take stuff like that nor did I ever think this was gonna escalate to this extent. I figured when she first approached me with the idea of a threesome I thought it was great that she communicated with me instead of just forge forward with it but now it seemed to spark a bit of an addiction it seems. Do I talk to her and just flat out tell her I’ve seen all this or ask her if she’s into cuckolding or bbc. Where do I go about talking this through?