"Where have you been?" Sheri asked when her brother came into the house later the next afternoon.

"I had some things to take care of," Charles replied, wiping the sheen of sweat from his forehead.

"Last night," Sheri began.

"Look, it's okay," Charles said. "We can just forget it. It never happened."

"I can't stop thinking about it," Sheri said.

"What exactly is 'it'?" Charles asked, feeling his cock aching in his shorts.

"Just all of it," Sheri replied. "Do you really think I could do it?"

"That's up to you," Charles replied. "If you want to do it, you can, but clearly you have reservations, which I think is...