Everyone in the family knew Uncle Billy was bisexual. If he couldn't get a date with a woman he would go with a man. He had told my sister Joni and I he was versatile, that means he liked to give as well as get when it came to men.
He would come over and watch soccer with Joni and me sometimes. When I moved in with Joni he started coming over more. We wondered if he knew we were having sex. We didn't care, we were just curious.
One Saturday we were all on the couch watching a boring game. Joni was sitting next to the arm I was in the middle and Billy was leaning on the other arm. Joni was wearing a nice summer dress. It covered everything, but hugged her curves nicely. I was wearing a pair of board shorts I had picked up in Hawaii. They have an elastic waistband and are loose. While I had been sitting there they had slid down a bit, and I hadn't bothered pulling them up.
Joni leaned over and stuck her tongue in my ear. That always made me instantly hard! I could feel my cock getting hard and starting to push out of the top of the shorts. I was looking at Joni and didn't notice Uncle Billy looking at the head of my cock that had just shown over the top of my shorts. The next thing I know is he is pulling my shorts down. Then he leaned over and put his lips around my cock.
I was a bit shocked, but I liked what he was doing so I didn't stop him. Joni looked over and raised her eyebrows. I shrugged and kissed her deeply. Billy was great at giving a blow job. He licked it up and down. He relaxed his throat muscles and took all of my cock in. Then he put suction on that blew my mind. He ran his tongue all around the head and down the ridge to my balls. He gave a better blow job than Joni, and I told her so. It was hot watching his head bounce up and down on my cock.
This went on for about five minutes. Billy would bring me to the limit and then back off just at the right time. I had heard it said that men can suck cock better than a woman, now I knew it was true.
Joni had pulled her right breast out and was kneeling so I could suck and nip it. At about the six minute mark I couldn't hold back any longer. I didn't give Uncle Billy any warning; I just started shooting my load. He had built me up and I was shooting more than I had ever before. I thought I was going to drown him. But he put a lip lock around the head and swallowed as much as he could. Some cum dripped out of his mouth and down my cock.
When I was done shooting he pulled back and sat up again. Joni looked over and saw the cum that had dripped and leaned over and licked it up. Then milked my cock a bit to get the last drop and licked it from the tip.