A mother and son accidentally swap bodies and have to learn to understand each other in order to swap back in Freaking Friday, available on Body Swap Stories or Smashwords.

"What are you even doing in my house?" Erica huffed at Seth. "Have you been following me all day?"
Seth grinned but didn't answer right away. He let his eyes trail down to Erica's bare tits. She saw him looking and shifted awkwardly, slipping her hands into the back pocket of her jeans as her nipples grew to sharp peaks of arousal at his leering look.
"We just happened to be going in the same direction," Seth said.
"Uh huh," Erica muttered.
She didn't know why she didn't just kick him out. Instead she watched him expectantly, as if waiting to be told what to do. And that was exactly what she was doing. She didn't know it, but the necklace Seth had tricked her into wearing gave him complete control over her. He'd left it in a box on her doorstep with a note claiming it was from her boyfriend. As long as she kept it on she would do anything Seth told her.
Erica was such an aggravating bitch that Seth couldn't wait tp humiliate her. The first ting he had her do was take off her top and bra before going shopping. She walked topless, oblivious to the fact that people gawked. And then Seth had ramped it up, ordering her to get hornier as people stared at her tits.
Now back at home, Seth figured she must be dripping but she hid it well.
"Slide those pants off and show me your body," Seth commanded.
"Fine," Erica said, maintaining her bitchy, aloof attitude even as she slid the pants down her legs and posed naked for him. Sure enough, her panties were soaked.