I was staying the summer at my aunt's. She had two girls, age 16 and 17. They would constantly harrass me, and chase me around the yard, try to 'capture' me and tickle me. Needless to say, they would get me on the ground and sit on me. I began to notice that whoever was on top of me would sit on my cock, and rock back and forth till I got a hard on. Then they would laugh, let me up and tell me to go away. Naturally I would go to my room take out my cock and masturbate till I came.
Well, one day they told me to go away, and I went to my room to jack off. I was naked, and rubbing my cock, when the door burst open. There they stood, looking at me and laughing. They entered the room, and closed the door. They made me just stand there, with my hard on, and play with myself. If I came, they would tell my aunt, so I had to just edge it. It was then that they tackled me, made me lay on the bed and started to tickle me. Of course sitting on me and rocking, they made me cum. They spread my legs, and tied my legs and hands to the bed. I could not move, and they began to fondle my cock and balls. They made me cum at least five times that afternoon. My cock was so sore, and my balls hurt. However, I enjoyed every moment of the ordeal. Finally, they undressed themselves, and masturbated in front of me. Their wetness just squirted out on me when they came.
They told me that we would do this every day till I left.
The surprise was the day my aunt caught me, with my cock out, and jacking off.