Pornography addiction

So I have a brother he's 18M. When I come back from uni kama hii December holiday, he normally borrows my laptop from time to time, me being a good sister huwa nampea. Nadhani kijana anaenda kuwatch movie nayo kumbe ni porn. He doesn't even clear the search history (I think ni ju hajui idk) but inanidisgust.

Kila time nikimpea lazima nipate Hadi sasa nimeanza kumnyima and he's now seeing me as a bad person. Sijui vile Hadi naeza bring up hiyo conversation. I'm assuming ako na addiction cause he stays with the laptop for long Kwanza on days I'm not using it.

How should I go about this? Sitaki aend up kukua slave wa masturbation aangushe game huko nje akienda uni bana.