There's this manga I've been looking for a long time.
Originally saw on HentaiCapitol.com in like 2004.

> Opens with ceiling shot of daughter in bed. Tomboy, pixie cut, tank top raised up to reveal one boob.
> She comes downstairs and her mom is blowing her dad in the kitchen.
> She complains and leaves.
> Later she comes back and her mom is hooking up with her boyfriend.
> She freaks out but then her dad fucks her.
> Text box when he first puts it in was "I was a virgin!".