This happened two days ago.
I was going to apply for a job and I would really need the help of my uncle by then because he works on the advertising company I wish to go. So he was expecting me to arrive within a week, but since I had fixed my schedule, I was able to go there earlier (and that was two days ago). I was not able to inform him that ill be arriving because his phone line was busy.
I reached his house after a two-hour drive. The door is open so I just went in. I was walking towards the living room when I saw my uncle (who was 36) stroking his cock while watching porn. Well, I have heard him jackin' off in his room before when I used to sleep over, but this was the first time I ever saw him stroking. His cock was huge, about seven inches, and it was fat. I got so aroused; I had my own erection while watching him. He was moaning to hard, the way the porn is doing! His moaning got heavier and he is stroking much faster now, I know he's gonna cum. With one final blow and a loud moan, he shot cum all over his body. He shot it on his chest, abs, and the other cum just flowed off his hand. He is soaking with his own cum now.
While catching his breath, that is when he noticed me. He panicked and covered his wet cock with his cum-soaked hand, still exposing his cum-soaked body. He was not able to utter any word. I just said hi, and then threw in a tissue from my pocket. Then I head towards the guest room.
After several minutes, I went back to the living room, and he was already in briefs. I laughed and said, 'Next time, make a tissue handy.' He laughed and threw the wet tissue on me. All day long we were talking about that experience and laughing about it!