Sexuality is fluid so this is cool, but god isnt it always a surprise? It usually happens somewhere completely inappropriate like under a blanket at a film night with many mutual friends and youre trying to not freak out but, goodness, maybe we should talk about it first. This is made more complicated if the girl in question has a boyfriend, but cheating with a girl doesnt count because its not like shes getting with another guy and also if her boyfriend saw her doing it then hed probably be totally into it and ABORT ABORT DONT GET INTO THIS SITUATION EVER.