Tabitha reached up and grabbed her older brother's penis. His cock, Mary corrected herself. It sounded like a porn word, but if that's what he called it, who was she to tell him differently?

Tabitha and Michael gasped in unison as her tiny hand wrapped around his shaft.

"Oh Tabby," Michael said.

"It feels so warm," Tabitha said, "Soft. But also strong."

"It gets hard so it can go in your vagina," Mary said, "When it's in you and it's your time, Michael's cock will produce sperm and that's how you get babies."

"I know that part, Momma," Tabitha said. She hadn't taken her hand off her brother's cock.

"Well,...