So I was 17 at the family bbq and I went inside to go to the toilet and I heard some noises from the other room and decided to check it out,it was my 13 yo cousin jerking off to porn. For some reason I decided to walk in,once he saw me he got super embarrassed and covered himself with a pillow trying to turn off the porn I told him its ok while slowly closing the door and sitting next to him telling him that its super normal and nothing to be shamed about, I asked him to show me which porn was he watching and funny enough I already watched that one we talked a little bit and I saw him getting a little bit more comfortable I nervously offered him help and he accepted it. Long story short I gave him a handjob and helped him cum. We never talked about it ever again and everything stayed completely normal between us no weird looks or anything