Her older son.

Sarah awoke lying face-down on a scented pillow; the scent was unfamiliar. All she could see before her was a red haze. She tried to push herself up but her hands were tied in spread-eagle position. A quick test showed her feet were, too. The air moving slightly across her body informed her she was still nude.

"What the hell is going on here?"

"Oh, Mother; I'm glad you're awake. We need to talk."

"Aaron? What have you done?"

"Just taken some precautions. I wanted to have a chat with you, perhaps to make a deal about Father's estate. However, first matters first; you look thirty years younger."

"Flattery ill-becomes you, boy."

"It's not flattery. You know how you wanted your svelte waist back, the one you had before childbirth? It's back." Her son's firm hands ran down her sides and she knew he was right. "Your behind is firm, and your breasts no longer sag. Even those tiny wrinkles and crow's feet have vanished. In fact, you look like you did before you married Father; eighteen, I'd say."

"Hah!"

A red sleeping-blindfold with white lace borders came off her eyes and a mirror was placed under her face. Then a pair of hands grabbed her breasts and lifted her upper torso so she could see in the mirror. The face was one she hadn't seen in the mirror in many years.

"Do you believe me now?"

"How did this happen? And why did you tie me up?"

"I didn't tie you up, Mother, I tied you down; consider it symbolic. As for what happened to you, according to the manual for that disgusting device its primary effect is to revert your body to its peak of physical and sexual prowess. That means, physically, about eighteen years of age."

"That's wonderful! Untie me and we can celebrate."

"Not so fast. I'm an impatient man; I don't wish to wait another thirty years to inherit. I did some thinking, and have come up with a simple yet plausible story. My mother vanished, murdered by some unknown assailant."

"What!? But I'm–"

"Obviously not Sarah Gillis. After all, people don't simply wake up thirty years younger. In fact, you're the prime suspect in Mother's disappearance. Two birds with one stone, as it were."

"No! You can't! What about decency?"

"Decency? I don't recall any talk of decency when Father used to tie me down and shove his cock up my ass. In fact, I recall you said at the time it would teach me an important life lesson; congratulations, Mother, it did. Except rather than just fucking you and taking what I want, I'm going to offer you a chance."

"What chance?" Sarah was ready to do nearly anything now that she realized how precarious her position was.

"Marry me. You'll get to share the inheritance and gain the attentions of a twenty-eight year old man with strong appetites."