What can you do when your bitter partner wants to fuck you?

Every day i left work bitter because of my smart buddy and i didn't understand why until a couple of days ago. we were in the office and when i thought he was going to give me one of the answers he edges down my fly and grabs my cock. i was unable to react. the truth is that it drove me crazy how he ate my cock, my ass ... now i understand why he was so bitter he wanted to fuck my ass.