Weekend BF swapping

I had never had sex with anyone else except my boyfriend until last weekend.
One of our friends is dating my best friend. His parents were going out of town for the weekend so we all arranged to spend the weekend at his place. Just the four of us.
Well the first night was pretty standard. Loud music, movies and a few drinks.
The next day was pretty much the same but we got drinking earlier and all chatted about who was better in bed and who gave better head. So we had a contest where my friend and I would each give our boyfriends head and first one to get them off would win. I was the winner!!!!!
So then it led to each of us having sex with our own boyfriend right there in the living room. Fucking us right there in front of each other. I'm not sure who started it but they were back on the topic of who was better in bed, and only the girls could judge so we decided to swap. It was just like a porn movie.
My friend told me afterwards that she thought my guy was bigger and better, I agreed but told her I didn't mind hers either as he lasted longer.
The rest of the weekend was pretty much like that.