I treated my BF to the best birthday surprise you could get

Last year for my BF’s birthday I wanted to do something really sexy. I was still in university so stayed with my Friends at this time. My BF isn’t much of a partier but I convinced him to come over and we’d have a good time. As friends we always spoke about our relationships, conversations we’d had and all kinds of different topics. I told them how he had always wanted to be shared and have new experiences sexually. Both my friends were quite recently single so hadn’t had sex for a while. That night he came over we had some drinks, slowly warmed the conversation up and eventually got speaking about sex and fantasies. He told us all about his groused fantasy and one of my friends mentioned to him it could be fun for us to see what he’s packing. So he took off his underwear so we could all see. We could see him slowly getting hard and before long he was masturbating for us. We began to join in, all 3 of us. So at this point there were 4 of us all masturbating together. We moved things down to the bedroom and began to swap partners and make out. Before long my BF had my friends sharing his dick whilst we kissed. I could tell this was turning him on massively as his lip always trembles when he’s super horny… I shall leave the rest for anyone interested to find out by DM