Watched my girlfriend fuck our mutual friend for the first time [cuckold’s perspective]

My girlfriend and I (both 25) have been fantasizing about cuckolding for almost 6 months but only just found a chance to make it a reality. I generally have pretty low stamina and over time became obsessed with the idea that someone else could fuck her better than I could. The other guy was an old mutual friend of ours from college who would still try to text and hit on her sometimes. I encouraged her to start responding to him they started chatting and then began sexting and exchanging pictures. Eventually we set up a meeting at a bar.

She dressed up nice in a short black dress that made her body look amazing. For context she's 5'1 and petite with strawberry blonde hair, nice curves and c cups. We hung out for a while and he got pretty flirty with her. Watching him put his hand on her bare leg made me super hard at the table. Later we went back to our place and she changed into a set of strappy black lingerie and before I knew it she was straddling him on the couch while they made out. She pulled out his cock, which was a bit longer and significantly thicker than mine, and got on her knees. Seeing her look at me with her blue eyes with his cock in her mouth was the hottest thing I'd ever seen.

From there he picked her up and carried her into our bedroom. He peeled off her lingerie slowly until she was laying naked in front of him. She was super flushed and breathing hard and I could tell she was insanely turned on. He teased her for a while, running his hands and mouth all over her, and then took her from behind. She arched her back and moaned loudly when he penetrated her and I almost came in my pants. Soon he flipped her over so she was on her back. Seeing her spread her legs wide for him and fully submit made me almost nauseous but it was so hot.

They fucked three times over about two hours, way more and longer than I've ever been able to. I watched for a lot of it but also spent some time in the other room just listening. Between times they would take little breaks to get a drink or snacks but he would always have his hands all over her. It was like she was his girlfriend and I was just a random guy.

When he eventually left she jerked me off into a towel while she whispered how good he felt and how badly she wanted to cuck me again. Our friend was only in town for work and won't be back anytime soon, but after seeing how much she enjoyed herself I don't think we'll be able to go back to how things were. Not that I'd want to of course!