Confront her father

"Yeah, sure, but first let's talk about you." Penny pointed an accusing finger at her father.

"It was just a mistake. I was surprised." He looked apologetic and put up his hands defensively, as though at gunpoint.

"That was a pretty hard stare for just 'surprised.' You didn't react until I did."

"I... guess. I've been working long hours, and I haven't had much time with women since the divorce. That doesn't make it right. I was caught off guard, what can I say?"

Penny opened her bathrobe on purpose, baring herself for her father to see. She meant it as a challenge--expecting him to look away in shame--but something felt wrong. Heartbeat... breathing... her own attention on her breasts...

Her father didn't look away. His face turned red and he held his breath. Penny could see a bulge in his pants.

She wanted to see more.

The world felt unreal as she stood up and threw her bathrobe on the floor. Her father looked slowly up and down her body, and she craved his attention this time.

Penny put one foot on the table and pushed her hips forward, exposing her rapidly-moistening pussy in what she hoped was a seductive act. Her father couldn't look away from it.

"I guess you owe me, Daddy. It's my birthday, after all."