I [M] fucked my gf [F] while she fucked her friend [F]…

First time gf and I ever did coke was with a friend of hers. We did it off a plate at first, didn’t take long for them to get horny high and get in the underwear, did it off each others tits and ass. It was hot but I still had my clothes on and couldn’t get hard. Her friend went to the bathroom. When she walked out my gf told me her friend is always joking about giving good blow jobs. I told her I didn’t want to do that just wanted to watch them. Her friend came back in and we did some more