Next time lock the door.
You did nothing wrong. He should not have walked in on you in the first place, you are old enogh and entiled to that respect and privacy. Like the other poster said, "lock your door" next time.
completely not your fault. He's a dick. He probably doesn't want your mom to know he walked in. Don't worry.
Lock the door and get under the covers! He probably won't tell because he was embarrassed too but even if he does, just remember that EVERYONE does it and you won't go blind.
He probably wanted to watch ,but knew that it would cause trouble...
