Mark Howard was about to shoot his wad when the door opened and his cousin Betsy tiptoed into the room. When the cute redhead moved toward the bed, the boy's cock gave a wild lurch and he dove under the covers.

Mark's father and Betsy's father were brothers. Mark and his parents lived in a townhouse which was attached to two others. The second house was occupied by Betsy and her parents and the third by their grandparents. All three families had privacy when they wanted it, yet they were able to go from house to house with ease.

This particular weekend the youngsters' parents were away and they were being supervised by their grandparents. It was almost like being alone. Molly and George were loving and kind, but they adored their only grandchildren and let them run wild. Now Betsy sat down on the edge of Mark's bed.

"Are you sleeping?" she said.

"Yeah," the boy said, switching the light on. "I always talk in my sleep."

"I can't sleep," Betsy said. The little redhead had the body of a woman and the mind, of a child.

"Miss your folks?" Mark teased, squeezing his cock under the covers.

"Don't be silly. What are you doing?" Betsy said, her face flushed with embarrassment.

Mark quickly released his prick and brought his hands out into full view of his cousin.

"Nothing. I'm not doing anything."

Betsy gazed at him suspiciously, shrugged, and brought her feet onto the bed.

"Why should I miss my folks?" she said. "You're here and so are Gramps and Gram."

"What time is it, anyway?"

"One or so." The teenage girl sniffed the air. "Were you jerking off when I came in?"

"Yeah, so what?"

She giggled and climbed under the covers. "Well, why didn't you say so? Is your cock still hard? Can I see it?" She felt around for his cock, but he pushed her hand away.