This actually happened
When my aunt was younger, she had a one night stand with this guy while on vacation. She had a son and the father was never part of his life. She moved into my parents house and two years later, I was born. My cousin and I grew extremely close over the years. We were almost like brothers. When our parents were out, we would talk about sex and masturbation all the time. Later in the night, I would masturbate thinking about my cousin jerking his cock. (We had separate rooms). He told about his conquests with girls from our school and his stories always made me super horny.
One day, my parents and aunt went to a baseball game and I decided to visit my friend. My cousin, 17 at the time, decided to stay home and I rode my bike across the neighborhood to my friend's house. It turns out he wasn't home, and I although I didn't want to go all the way back home, I had nothing else to do. I quickly rode my bike home before it got too dark.
I parked my bike in the garage and walked into the kitchen. I knew my cousin was still home because his car was in the garage. I decided to look for him to see if he wanted to go see a movie or something.
As I walked up the stairs, I could hear a woman moaning. As I got to the top of the stairs, I realized it was a porn. I saw the light from my cousin's room and approached it. I opened the door and was caught extremely off guard. I don't think he heard me come in because there he was, spread eagle, with a bottle of lotion and a box of tissues next to him. My jaw dropped and I saw in his hand his hard, 9-inch dick in his hand. He must have seen me staring at his dick, and he asked me what I was doing. I stuttered out a 'sorry' and went for the door. He told me to stop and asked if I wanted to join him. I turned around and he made room for me on his bed. I thought why not, stripped off my clothes, but left my boxers on, and laid down on the bed next to him. He was watching a threesome porn with two girls and a guy. He wondered why I was so shy and motioned for me to take off my boxers.
I slid them off and he was impressed by my 7-inch uncut boner. He lubed up my dick and started stroking. He told me not to be shy and to grab his. I reached over and slid my hand up and down his beautiful dick. Soon, our eyes were off the porn and on each other's cocks. We turned off the tv and went to 69 position, stroking each other's dicks. After about 20 minutes of intense stroking, I felt his body tense up and he erupted, spewing eight squirts of cum all over my face. This sent me over the edge and I cummed more than I ever had on his face.
We looked at each other and just smiled. We showered together and shared a quick passionate kiss too. During the following year, before he went off to college, we experimented some more. Our adventures went from each other's hands, to each other's mouths, then asses. We shared some pretty awesome times together, stories for other times.