An unexpected threesome

I never knew my friend Mark was gay; he had always been a bit homophobic, so nobody suspected him. It was a company party and Mark wasn't there, so I went to look for him since I hardly knew anyone at the party. I hear Mark's voice in the garage and I go to see, and I see him on all fours, ass up, with Leo, who is the marketing boss, giving it to him hard. While he was saying to him, all macho, "But how you like my cock, faggot, like a little faggot," while Mark was saying he wasn't a faggot while raising his ass higher. Both were surprised when they saw me and Leo laughed and said to me, "Hi Alex, look at the little macho I'm fucking, don't you want to join in." I took out my cock and rubbed it against Mark and Leo spanked him and said to him, "Don't you know you have to suck it when it's offered to you?" Mark started sucking and slurping like a total professional and Leo said to me, "You like it? We can share him." I was kissing Leo while Mark was sucking it eagerly; I took it out of his mouth and started putting a finger in Leo's ass and he says to me, "What are you doing, Alex?" and I, "I want to be the only macho tonight," I said in his ear, and Leo laughed and said to me, "I think it's fair because of your silence," while I was putting it in Leo's ass and Mark was moaning. Hearing those two machos moan like females turned me on while I moved my hips, my balls slapping against Leo's ass, how great, in Mark's ear hearing the pounding of my balls against his buttocks.