Why I’m the way I am ?

So we’re teens. It’s her birthday and there’s a party at her house. The night goes on and every one has left her girlfriend and a buddy of mine. She has a basement bedroom and her parents are upstairs watching TV. They tell my buddy and I to lay dow on the bed. They come over, her girlfriend pulls out my dick and she pulls out my buddies. They start sucking our cocks. Now the blow job im getting if fine but what’s really w w turning me on is watching her with someone else’s cock in her mouth. She’s really going to town on his dick. He’s morning, she’s moaning. So my buddy starts to freak out a little because he’s worried the parents are going to come downstairs. He tries to get her to stop. I’m like are you k**ding me dude, just enjoy it. He tries to get up. I reach over and grab his hands and hold him down. Apparently this turns him on because not 30 seconds latter he shoots a massive load in her mouth. Then watching her swallow his load is putting me over the edge. I cum hard in her girlfriend’s mouth. We zipped up and never said a word. Although years latter I found out that he got off big time being tied up.