Help! I caught my little brother watching porn!?

Me & my 2 brothers were watching tv on the living room. One of them (medium) left to bed. I went to get online on my room. Suddenly i heard this moans and sex sounds. I picked through the door and my 10 year old perv brother waz watching porn! My 13 year old brother doesnt even do that. I was like WTF! I made foot sounds so that he knew i was coming & acted like i was getting a drink. When i left, he puts the password & began again. What should i do. I mean i watch it but im 17 & often. But he would've gotten his *** kick if my mom came out. Should i block it? Should i b proud? It'sawkwardd.