So fucking embarrassing. He came home earlier than I thought and caught me in the living room. He didn't say anything. Just kept talking on the phone. Somehow in porn it always seems so much hotter to get walked in on, but this wasn't the case at all last night. I wouldn't mind hearing about others' experiences.
Looking at your pictures he hardly could have missed it.
If you haven't yet discussed it, maybe you should tell him that you need some privacy now and than and that you will respect his privacy too. He has his needs too so it could happen also that you walk in while he is jacking it.
Don't forget to thank him for the way he was reacting!
In other treads about this subject I have written that if you have to share the same space and you are both young men, you have to talk about this. Masturbating is very common. Better to know that you can do that while your roomie can hear or even see you.