Long story short, me (M28) & my gf (F25) have been opening up to each other about our kinks and fantasies. We started very vanilla and we’ve slowly started to venture off into new territories. I have a huge threesome fantasy, as many guys do but I’ve also been interested in seeing her fuck another guy in front of me. I never thought I’d be a cuck but the idea turns me on so much. I’ve been opening to idea of trying a threesome (MFM) and slowly work up to her cucking me. She was very against it at first but then started slowing getting into the idea as we talked about it more. Which led to role play and dirty talk while having sex. Welp, I randomly through the idea of reversing the role and have me cuck her. Ngl I was scared but she was actually turned on by it. I whispered a scenario where she would be in the corner playing with herself and I’d have another girl tease her by fucking me etc. I have never seen her so turned on. Last night, we finally watched some threesome porn together and it was insane. My mind has been blown and honestly, cucking each other seems like a dream come true. We still have lots of milestones to hit before we could make this reality but this is a huge start.