Her son.

Sarah woke up with a cramp in her shoulders. When she tried to move her wrists, bound behind her back, refused to separate. She tried to move her legs and found her ankles bound as well.

"What the...?"

"Ah, so you're awake." It was the voice of her son John. Why was he..? Of course! He was coming back from college for a visit!

"Oh, John! Thank God it's you. I thought there was an intruder in the house. Now untie me, please."

"There was an intruder in the house: you. Who are you, and where is Mother?"

"I am your Mother, boy. Have you gone blind?"

"I am certain my mother is not an eighteen-year old slut who would masturbate on her bed."

"What?"

Sarah was getting ready to scold her impudent son when it registered. She was forty pounds lighter and a cup size smaller; the skin on her breasts was smooth and firm. The stretch marks were gone, as were all traces of having given birth. Her skin felt smooth, and all the aches and pains of middle age were nowhere to be found. She was young again!

And she was in the presence of her nineteen-year-old Mama's boy of a son; a young man with absolutely no imagination, except when it came to mistreating his girlfriends so badly that his parents had to buy their silence.

"John, I am your mother. Do you remember that time when you were thirteen and got that twelve-year old slut pregnant?"

"Not really."

"How about the time your girlfriend claimed you had **** her when you jacked off in her face, then left her tied up on the high school lawn?"

"Which time?"

"God, John, what will it take to prove I'm your mother?"

"How old was I when I stopped breast feeding?"

"Nine."

"Lucky guess. I'm going to think about it; you shut up and don't confuse me."

He sat there, storm clouds rolling across his face. After an almost geologic pause he grinned.

"I know how you can prove you're my mother."

"Good! Anything!"

He took off his clothes and pulled her legs apart.

"John, no!"

Wordlessly he started rubbing her snatch. His hands were rough, which she normally would have liked, but not that rough and not from her son. She was slow to lubricate, but it eventually happened anyway. He bodily lifted her off the bed and rammed her cunt down onto his erect shaft. He repeated thrust up with his hips and pulled her down at the same time, banging her harder than anyone had ever done before.

Afterward he looked down at the tearful woman. "I didn't think you were my Mother. She would have liked that."

"Too much, John. It was too much."