Looks like you were all too willing to have sex with your gay friend and didn't resist at all when he started kissing you and playing with your body in preparation to fucking you. And when he lubed you up, you knew what was about to happen and didn't resist as he inserted his erect penis into your rectum and proceeded to fuck you. Guess you'll be doing that a lot more often from now on.
And when you leave, the thought that his cum is inside your stomach or ass, that you've seen, touched, smelled and tasted his body and his body fluids. He's had you and you him. It's why I love eye contact when having sex with someone, my penis is inside them and we're one for that moment in time. And time is so fleeting...
I agree. Knowing that you're powerless to let another man have his way with you, touching you, kissing you, fondling you, and then holding you down as he gets on top of you and inserts his erect penis into your body is an incredible thrill. You enjoy feeling his weight on you, feeling his trusting in and out of your helpless body, and then you get the most incredible thrill as you feel him cumming and pumping his seed deep into your willing submissive body where you really want it and know that it belongs in there.