I don't know how befriending certain succubi work. Most of them have conditions that seem to be explained if you try to befriend them at max love gauge, but these are hard to fulfill. For example, the lesser imp says I'm too strong for her, but I can't lower my level with the cheshire crystal yet. The rest are just confusing, like the cow girl wanting me to "talk more to her", despite having exhausted the talk command in one battle. Is there a way to know for certain how to deal with those conditions?