or 20s/30s guy is in charge of a not related young girl.
- the father has to be the main character who has responsibility for the girl
- the nonsexual part is more about the Father/Daughter pairing, so no incest. normal sex that the father or the daughter has is okay (or any other secondary character), just not between F/D.
- older brother (10+ years difference) is also ok, if he is the one responsable for her.
- "adoptive" stories like the "supposed to be true" amputee-chan and blindmute loli are also ok
- setting doesn't matter
- age doesn't matter, could even be older than 18 if the daughter has a disability and must be cared for.
Edit: doesnt matter who the POV is, either Father or Daughter