Tim was in good spirits as he walked along the street towards his parent's house. The last class of school had been cancelled, and so the students had been allowed to leave early.
As he walked he thought about his Aunt Tina, as he had done every afternoon this week. Aunt Tina was his mother's younger step-sister, and she had been staying with them all week. She lived in a city a couple of hundred miles away, and she always visited them at about this time every year.
Tim always looked forward to her visits. When he was young she always brought him a present, and spoiled him while she was visiting. But the last couple of years he had especially enjoyed her visits for a different reason. For a woman in her early thirties she was really hot! She had never had children, and she still had a fabulous figure. Her tits were to die for! It was almost too much for an eighteen year old boy who had never made it past second base with a girl.
Tim walked up the side path to the back of the house. He was hoping that Tina would be sunbathing by the pool. She always wore really brief swimsuits that showed off her fabulous figure to perfection. But when her entered the back yard her saw that the pool was deserted. Disappointed, her went into the house and saw that the living area was deserted as well.
As Tim climbed the stairs, he heard noises coming from his parent's bedroom. They were the unmistakable sounds of a man and a woman having sex. He had heard his parents having sex before, and a couple of times he had peeked in when they had not closed the door properly. But this time the woman's voice was not his mother's.
The door wasn't closed properly, and when Tim peeked through the crack he was astonished at what he saw. His father was lying on his back on the bed, and sitting on top of him was Aunt Tina!
Tim stared. Even although he was in shock at what he saw, it was impossible not to be impressed by the nude figure of Aunt Tina. She had a beautiful round ass, and he could see the side of one of her lovely breasts. And as it bounced up and down he could just see the outline of a big pink nipple.
Tim watched in fascination for a couple of minutes, but then he left and silently went back down the stairs. He left the house and retraced his steps back down the street towards school. He decided that he would return home at the usual time and pretend that nothing had happened. But all he could think about was Aunt Tina and how beautiful she looked naked.
When Tim returned home his mother had arrived. For the rest of the day everyone acted as though nothing unusual had happened.
The next day Tim arrived home at the usual time, and once again he went around to the back yard of the house. This time Tina was sunbaking by the pool. "Hi Timmy, how was your day?" she asked when she say him.
"OK," he replied. "Think I'll go for a swim."
Tim disappeared into the house. His parents were not at home. He changed into his swimmers and went back out to the pool."
