I caught him

So last night my boyfriend came over to spend the night and he went to take a shower and I was in the bedroom getting ready for bed and I heard moaning coming from the shower I opened up the door and caught him masterbating in my shower to porn he’s never done this before ...I don’t know what to say to him? it was awkward for me to even catch him .. I plan on talking about it with him today so if there’s any advice I could get on this situation please let me know