Here's my story...
My parent's divorced when I was about 7, and I spent every other weekend and half the summer with my dad. I guess when I turned 11 or so, my dad took a job out of the area and he had to get an apartment. Since money was tight for him back then, he ended up in a one-bedroom. So when I spent time there we had to share the bed. I had just started jacking off about that time and I was horny all the time!
One night during the summer, our air-conditioner fouled out and it being the weekend, no one could come until Monday morning. So we roughed it with fans and wearing as little as possible. That night, I was really suffering in the heat, so I asked my dad if it would be ok to sleep without anything at all. He agreed and said it was a good idea. After he got out of his shower he stayed naked the rest of the night.
I hadn't seen my dad naked in a long time (not since we bathed together when I was very little) and I was kinda shocked-I couldn't stop looking at him.
Anyway, later that night when he was asleep, I found ways to hug him. When he was really out and snoring, I discovered he had a HUGE hardon! I just kept admiring how big it was! This went on for about 10 minutes until he snorted and I thought he'd wake up. I got up and went to the bathroom to jack my cock. When I came back, he was on his side and I didn't get to see it anymore