(21F) Cried into pillow he was so big

My BF (24M) and I have been living together for only a couple months. Very early on into living together I caught him cheating on me; he was getting sn@ps from a coworker, I saw some nsfw stuff, waited til he went to sleep, went through his phone and found texts, pics and vids. I confronted him and he cried and apologized and begged for another chance. We still have like six months left on our lease so I told him I would forgive him and try again but only on one condition: we open up the relationship but only on my side. He reluctantly agreed.

For a long time I did nothing. Occasionally I would get dressed up and say I’m going out and not give any details just so he’d have to wonder, but I was always just going to meet a friend or something like that. Then I finally matched with one of his coworkers, Marcus. We started chatting and I explained the situation and asked him not to say anything to my bf about it. He agreed.

Last night was the big night. My bf had his rec league basketball game last night, I told him I had a surprise for him when he got home and I sent him a pic of me in lingerie. He got really excited, came home earlier than usual. Marcus and I were sitting on the couch, chatting, his arm was around me, my leg was over his. My BF puffed his chest and said what was this?! I reminded him of our agreement and asked him not to upset Marcus because he was much bigger than my 5’10 BF. He said he thought I’d gotten over that and he only agreed because he didn’t think I’d ever go through with it. I reminded him that he agreed to move out if he doesn’t go through with it. He reluctantly agreed but said it would be only a one time thing.

I made him sit in his office chair in the corner of our bedroom. I kneeled in front of Marcus and slowly pulled down his sweatpants and immediately realized I should’ve asked how big his dick was before we got to this point. Even soft it was bigger than my BFs, it was so huge I was scared and knew there was no way I’d be able to handle it. I could barely fit the head in my mouth so I spit on it and stroked it with both hands. I looked at my bf and talked about how big Marcus’ dick was. Then he picked me up and put me on the bed, he yanked my shorts off and my tank top then tried to fuck me missionary. It felt like it was splitting me in half and I didn’t want my bf to see me in pain so I flipped over to doggy facing away from my bf. I grabbed a pillow and screamed into it as Marcus pushed his giant cock inside me. I thought dicks like this were a myth! I only had 3 bodies and none of them were built like Marcus, tall, muscular and hung thicker than most 🌽 ⭐️. It hurt so bad as he pounded me, the stretch felt like it was tearing me apart and the hard thud on my cervix made me want to die. I was crying into the pillow as his balls slapped my clit with each thrust. I was completely feeling the karma of trying to get this revenge.

Sex had never hurt that bad in my life, not even my first time. But something happened during all the pounding l began to feel rolling waves of euphoria. My body finally relaxed and I started to feel him past my cervix and now every thrust felt like it’s own mini orgasm. I couldn’t control my body, it just started trembling and when he pulled out it would convulse in orgasmic shockwaves. He flipped me on my back, put my legs over his shoulders and pounded me into mindless bliss while my bf watched in sadness. I lost track of time, I couldn’t tell you my name in that moment, just laying there getting fucked into mindless orgasmic mush. I remember feeling a sudden rush of warmth and then Marcus pulled out and slapped his cock on my stomach a few times before a gush of his cum came pouring out of my pussy onto the bed. He told my BF to lick it up or move the fuck out and when my bf got close Marcus shoved his face all in my pussy getting it sticky with his cum from cheek to cheek, nose and chin. My clit was so sensitive just his nose being smashed into it gave me another orgasm.

My bf took today off from work and moved out. He’s going back to live with his parents. Marcus is coming over tonight, I’m cooking him dinner.