"Does this feel good?" Jeff asked, and massaged his sister's breast gently.
"It does," Jamie replied. She didn't sound ecstatic or horrified. She just stated it blandly. The pleasure didn't seem to matter to her.
"Would you like me to rub a little harder?"
"I would."
Jeff pressed harder into his sister's huge breast. He lifted his other hand from her waist and cupped her other breast, pulling her body backward into his. They sat that way on the couch, and he tried different things with her breasts: lifting them up, pressing them together, pulling them apart. All the time she stared at the TV.
"You'd tell me if this hurt or made you uncomfortable, wouldn't you, Jamie?"
Jamie let go of her hands, turned around, and hugged him, because he'd said her name. "Of course I would," she said, smiling.
"Oh, Jamie," Jeff said. "Jamie, Jamie, Jamie."
With each repetition of her name, Jamie increased the hug, pressing her breasts into her brother's chest. She started to tremble.
"Jamie," he breathed. "Jamie. Jamie."
Suddenly Jamie's body clenched. Her back arched, and she dug her fingernails into her brother's back. "Oh! Oh! Oh Jeff!" she cried out.
After a moment, the tension drained from Jamie's body. She slumped down, still hugging him, while he kept massaging her breasts. "What just happened?" she asked.
"I don't know," Jeff said.
But he did. Her mature body, with the stimulation of the hugging and the breast massage, had just undergone its first orgasm.
And he still had a raging hard-on for his sister's newly voluptuous body.