Caught Relative

I lived with my mom's brother for a while when I was in my early 20s. He had been telling me there is this slut at the bar he thinks he's going to be able to fuck soon.
I got off work early on a Friday, I got home and uncle wasn't there. I let my friend borrow my car so he didn't have to walk to work. I was playing video games in my room when I heard my uncle get home. I heard him talking to someone and assumed he was on the phone so I didn't call out and say hey I'm home. After about 10min I took off my headsets and started to walk to living room. I heard the noises of obvious sexual activity going on... Grunting and moaning, I smiled and thought I'm gonna spy on him and that slut fucking on the couch.! I rounded the corner and my uncle was sitting on the couch naked, head tipped back.. As another guy who's back was to me was on his knees sucking him off. I was stunned and paralyzed for a minute, just then my uncle said fuck ya man I'm cumming! Ahhhh yeahhh empty me out man! The guy took his load and obviously swallowed some of it, some leaking on to the carpet.. He took his mouth off uncle's cock,.. and caught me out of the corner of his eye. Uncle's cock was about 6", thick and had a bit of an upward curve. What The Fuck! I heard the guy say, my uncles eyes bolted open and saw me and grabbed a blanket to cover his still hard cock. The sucker jumped to his feet, he had on a pair of shorts but he obviously had a hard on as well.
I muttered something like shit, sorry and turned around, I heard the sucker guy quickly use the front door to exit. My uncle yelled something about what the fuck was I doing home and grabbed his keys and quickly left on his Harley.
I stood in my room stunned replaying what just happened. After a moment I noticed my cock was about halfway hard and I realized I was getting very horny. I went out to the living room and got on my knees and spotted a wad of my uncle's load still on the carpet that hadn't dried yet.. I immediately pulled my sweats down, my cock sprung out, I grabbed it and vigorously masturbated, it only took like a minute and I was shooting it right on the same spot on the carpet my uncles cum was on!
Later my uncle came home, drunk, he asked if I wanted to talk about it, I said nope not my business and we never talked about it again. Years later I told my mom about it, she wasn't surprised, she had heard from others he was a frequent visitor to know gay hookup spots, adult bookstores and x rated theaters, and there was a video arcade that had gloryholes, she said she had seen his Harley there on several occasions when she drove by. I never told anyone else about it but still for a long time whenever I thought about it I'd get hard and I'd have to immediately masturbate to relieve myself!