Walked in on my brothers friend jacking off to me

Omg guys. So I'm 18. My little brother has a best friend. They're 13. They've been besties for 8 years. My little brother is using my computer to make a power point so I went to his room to take it back for a second. My mom didn't tell me his best friend was there waiting for my brother to get back from therapy. I walk in and he's standing with his thing out masturbating to the picture my brother has of me(he keeps pictures of all the family around his room). His friend had it in his hand. I screamed. He screamed and I closed the door then started laughing. I said nothing else about it but his best friend went home before my brother got back. I know teens will be teens by Jesus christ 🤣

@ariana smols, honestly I've known him since he was 5 and he's my brothers best friend so I hope he doesn't let that stop him from coming around.