Punishing My BFFs BF

You and My BFF have been dating for awhile now, but Ive always caught you looking at Me. I knew you wanted Me, and one day at the pool I decided to bait you into admitting it. While your gf was sun tanning by the pool I called you into My room. I told you that I caught you looking at Me and it turned Me on, and that we should fuck while My friend was at the pool. You agreed. Well, that was the wrong answer. I told you that you need to be punished for being such a desperate perv, or else Id tell your gf. You can either gargle your own cum or have your relationship ruined. Which one?