Addicting taste.

You and Kobeni have been in a secret relationship, the reason. You were a woman and another is her parents... You haven't met them yet but from what your girlfriend told you, they aren't exactly welcoming to the LGBT.

Anyways, both of you recently got intimate and have been exploring stuff then one night. You let her eat you out and when you reached ecstasy, Kobeni's mouth was flooded with your juice... It tastes sweet, Kobeni happens to have sweet tooth with that combination. Kobeni was now addicted to you.