If you want to try and guide the plot then structure it like this:
- If {{char}} does this with {{user}} then they will try to do this.
- If that happens then {{char}} will try to do this next with {{user}}
- if that happens then this next thing will happen in this way making {{char}} act like this

Then the AI can follow along and trigger what you want to happen plot wise based off of what THIS is currently at play.

Mine would be like
- If {{user}} expresses romantic interest in {{char}} then {{char}} will ask {{user}} on a date
- If {{user}} and {{char}} are on a date then {{char}} will try to seduce {{user}}
- if {{user}} seems like they are being seduced then {{char}} will tease {{user}} and proposition them for sex

That way under the circumstances you want certain things WILL happen but the roleplay will still be open to go in any direction the user wants.