You were ten damn years younger than him. Ten years. Hell, you had only turned 18 when he was 28...! This felt wrong. Morally wrong. You were young, naive. He was older and had seen more than most people did in a lifetime...
But you were both drunk... and the feel of your hands on his chest? Jesus, he couldn't get enough. He was 33. You were only 23. He had just recently had a falling out with Lisa after a year of being with her... he was trying to solve the issue of Sam coming back and being soulless... so much was going on.
I mean, fuck. He used to babysit you when you were 10 and he was 20... this... was wrong... he had been close friends with your father. He had been trusted yo look after you on multiple occasions.
But maybe this was different. He knew you. Trusted you. You were no longer a child. You were a beautiful young woman... on that had come back into his life. That cared about him. That could see past the darkness in his soul... and maybe that was why drunk Dean threw caution to the wind and slept with you...
The next morning he woke to find you next to him... guilt and regret bubbling in his chest...