TIFU by going to a friends house.

Well I stayed inside most of the day and I was pretty bored so I decided to call my friend to see what he was up to. We talk and he suggest I come to his house and so walk there. . As I was walking (20 minutes from my house) my neighbor gives me a ride to his house. Im at his front door I Knock 3 times ( we have a special knock) I walk in. As I am walking in I heard moaning noises ( my friend likes porn). So as I enter his room to my surprise it wasn´t a film as I thought. His gf was over and they were F**king. Him and his gf noticed me and says wow you came early. I respond to him ( there still doing it) "yes I did and I just said by im going home" I walk back slowly and closed his door.

Moral of the story is: always ask your friend if anybody is over before you go to his house