Plus the set up is eerily similar:
1. The main heroes are adult types who tries to have a distance between them (no touchy-touchy) and the much younger heroine.
2. Guy #2- The heroes' playboy bestfriend
3. Guy #3-Rival who's the same age as the heroine
4. Other guys who tries to get the attention of the main hero by going after the heroine
5. Harmless characters eg. butler and brother
"Faster than a Kiss" - Fumino, 16 years old, is dubbed as the leader of the delinquent girls of their class while Kazuma, 24 year old, is their plain looking homeroom teacher. And they're actually married! Thanks to Nicole via skribit.
"Hana To Akuma" - Vivi is a 200-year old demon who raised a human baby out of a whim . He named her Hana who is now 14-years old.