It was about a year into my now-ex boyfriend and I's relationship when he told me he was into cuckery. At first I was kind of grossed out by it because i believed in full loyalty however after hearing him talk about it for a few weeks I started to warm up to the idea. It came to a head when we started the cuck life by inviting his willing friend around and I sucked his dick, eventually turning into me giving both of them head on the couch until they came.

It had been a few weeks and my boyfriend wanted to continue to expand upon this kink, perhaps watching me getting fucked by someone. I was still pretty lukewarm on the idea but promised I was still looking for someone. One night I got talking to another of his friends. We hit it off and long story short we fucked and had a one night stand. Well... One night and the morning after. My boyfriend was none the wiser. Then it dawned on me: I could basically pretend to be looking for someone to cuck him with, never claim to find anyone and basically be a slut.

So across the next year or so I would have a bunch of sex with his friend, I blew somebody else I met in a club and gave a handjob to someone on my course. My boyfriend didn't have a clue about any of it and just thought I was still looking fruitlessly for someone to cuck him. It was so hot cheating on him while knowing I had a bit of a fall back.

Edit: We eventually broke up last year when we got into an argument and he said I wasn't even trying to get into his kink. So I called his friend and sent a video message to my boyfriend while I was getting railed by his friend doggy style in the mirror saying something on the lines of 'if only you knew how little you knew'