I need help

I have two male friends, the one is pansexual(Z) and the other one gay(T). They don’t have any interest in each other but a week ago they decided it would be fun if T gave Z a blowjob. They talked everything out and they did is yesterday. To T it was just an experience and he went on with his live. Z feels violated and as if T assaulted him. They had a save word and everything but I don’t think they had any communication while doing it. My girlfriend and I are close friends to the both of them so we are kinda trapped between them. We really don’t know what to do. We are in high School and between 17 and 18 years old so we have to see each other everyday.