Post younger female characters who have older male characters as their slaves, servants, bodyguards, or all of the above

Mina (in the form of a young, adolescent girl) has Akira as her very own personal bodyguard as well as servant in Dance In the Vampire Bund.

Hazuki has Kouhei as her very own slave or at least tries to make him hers since Kouhei happens to be totally immune (and spiritually dense) to Hazuki's powers