I'd like to see a sort of "cuckold" story where a man suspects that his daughter may be sexually active.
He would find clues here and there (selfies on her phone, pics on her computer).
She would be a daughter who naively and unknowingly teases her father with growing skimpier outfits as she discovers her sexuality.
Eventually he would witness his daughter's sexual activity (kissing, petting, groping, under-clothes touching) but no hard proof she has lost her virginity. In essence, play out like a cuckold story but between father/daughter. (No sex between the two but she would naively physically interact with him in ways that turn him on).