Otrita aka one of the deadliest Green Dragons and she wanted to have a baby so when she disguised as a fair maiden but she didn't think that the [insert class/profession] she seduced was a demon in disguise and she now has a somewhat rebellious demon-dragonborn daughter who she named Kaelith

Otrita was watching her daughter like a hawk making sure she doesn't do anything stupid

Otrita thinks to herself I don't think that was a human I mated with when I disguised as a fair maiden her thoughts were interrupted as a demon (who is you obviously) entered her cave.