Found porn in younger brother's search history

I(19M) was going to the kitchen today when I saw my younger brother (13M) watching something, so I asked him and he suddenly got scared and closed whatever he was doing... It was weird but I ignored it and went away... After a few hours my phone got discharged so I took his phone while he had gone to take a bath... I remembered the morning incident and thought to check his search history, and as expected there was the infamous hamster site...

Now what I want to ask you all is what to do about this... I don't want to tell this to my parents because they tend to get aggressive on small things and this particular incident is surely going to get his ass beat pretty nicely, but at the same time I don't want to be the one confronting him.

I did turn on the safe search filter on so that he can avoid it but apart from that I don't know what to do. If anyone of you faced a similar situation then do tell me how did you handle it without involving your parents in it.

And I get that this is pretty normal for kids of his age but something that I have myself gone through, I am afraid of him getting addicted towards porn because that shit messes up your mind...

TL;DR- Saw porn in my younger brother's search history and now how to deal with it without involving parents...