This is a great start! The lewd animations are sweet and the heroines design is cute!
I have left some thoughts that I got during my playthrough of version 0.0.5A below. I'm looking forward to seeing more from you in the future!
My Feedback
With the buffs the Defence skill gets during a run aswell that you can use it several times per turn makes it more optimal to not use the tease skills due to the latter costing both mana and energy.
My suggestions
Making Defence a once per turn skill makes it so that the player is incentiveiced to use the lewd skills. Making the three tease lust skills only cost energy instead of both mana and energy would also makes it align more with winning combat.
I think it would be really cool if there was an alternate win condition with the lust skills if you manage to make the monster orgasm or something ¯\_(ツ)_/¯
Story suggestion;
if Lily comes up with the idea of "distracting" the monsters with her body herself during combat rather then having her teacher directing her to do it gives her some agency
food for thought.