Gave My (Unaware) Father-in-law A BJ

I am Bisexual and nobody knows, not even my wife. A while back I was at an adult bookstore that had glory-holes in the viewing booths. I was looking thru the Porn tapes they had for sale…All of a sudden, I look up and see my father-in-law walk into the store. He went to the cashier to buy some viewing coins. I ducked down and went into the viewing room. It is very dimly lit with about 15 viewing booths.I hid in the corner, and when I saw him walk in, and went into one of the booths.I quickly entered the booth beside him. On entering, I rub my fingers on the hole in the wall connecting the booths…Then I see a cock stick thru the hole. I immediately started to lick the tip, then took the whole thing in my mouth. After sucking and liking for a couple minutes I could feel the head of his cock start to swell in my mouth, and then a stream of cum shot in my mouth…I swallowed it all. We are together for Thanksgiving and Xmas, I think to myself. “If you only knew”