Caught my dad masturbating!?

ok so i was about to go take a shower in my parents bathroom (nicest shower in the house) and as i walked into my parents master suite, i saw my dad laying on his back on the bed, COMPLETELY naked, and i saw his erect penis standing straight up and his hand rubbing it back and forth! about 2 seconds went by and he noticed i was there and he automatically jumped off the bed, his penis now flaccid, and he tried to cover his penis up with his hands but his testicles were hanging very low and his dick is very big so...it didnt work! and run into the bathroom! about 10 minutes later he finally emerged from the bathroom and went to sleep. (it was about 8 o'clock). i haven't talked to him since and its been a week! IDK what to do! please help