I started my senior year at a different high school, a few days later another kid started, and we became buddys. We rode the same bus, being guys and 18, and interested in making some spending money, we both mowed lawns. We spent a lot of time togather, both working and just hanging out, he spent nights at our house, I spent time at his. One friday after school we doubled up and mowed 3 yards, just as we got done it started to rain. We were only 2 blocks from his house, so we headed there, put the mowers in the gararge and went in the house. A note on the fridge said his folks would be late, so we were in his room, we both got horny, not the time, and got naked. I played with his dick till he got hard, then I was on my back on the bed with my legs around his waist and his dick buried in my ass. Just then his dad said, I'm sure glad its not the other way around. He walked out and closed the door, it embarrassed the hell out of me, but my buddy never missed a stroke, I still went over there, his dad never mentioned it, but I felt embarrassed knowing he saw me getting fucked that day.