Bobby followed his mother, his eyes gleaming as the breeze pressed her dress to her compact ass. His cock began to throb with greater hardness.

He followed her to his room, passing her as she held the door open. He sat on his bed while his mother closed the door.

Linda leaned against the door, not sure how to proceed, but knowing she had to say something. His cock was still very prominent in his pants, even though he was sitting down. She moved toward him, sitting on the bed at his side. Placing her hand on his thigh, she felt the heat of his flesh burn into her palm.

"Where do you hear those names that you call your sister? At school?"

Bobby nodded, very aware of her closeness.

"Do you know what they mean?"

"Some of them, Mom," he answered softly. "I know what slut means. That's what we call a girl at school because she does things. You know what things, Mom… in the restroom and under the bleachers."

"With you, too?" Linda asked, feeling a little jealousy well up inside her.

"Oh, no, not with me!" Bobby said quickly. "She's older, and all the bigger guys go with her."

"Bobby, that does not make her a slut," Linda said. "Some girls, well, they just need – even if they do things with boys, like you say, that doesn't make them bad, or sluts. They have needs, like you and Sarah and, yes, even me. Do you think I'm a slut, baby?"

"Not you, Mom! You're my mom!"

"And Sarah is your sister," Linda reminded him. "And I don't think Sarah is doing those things with boys, do you?"

"Sarah? No way, Mom!"

"Then she isn't a slut, is she?" Bobby blushed. "I guess not."

"What were you calling her today?"

"Aw, Mom, I can't say it to you."

"But you can say it to Sarah, is that it?"

Linda rubbed his thigh, feeling a strange excitement inside her body. She stared at his lap, seeing his cock, watching it move as hard throbs pulsed through it. She wrapped her arm around his shoulder and pulled his cheek to her chest, resting his head on the firm curve of her tit. Rubbing his back gently, she whispered into his ear. "You can say it to me, too. Anything you can say to your sister, you can say to me. I want to hear what you called her, Bobby."