Seeking Games with heroine choosing to loss/ use sex to advance the story

[VioletBlues]

So basically I am looking for games like Chronicles of Leridia and Cyberslayers, where the heroine can intentionally have sex with the enemy or lose, and the story revolves around that.
It's not just about losing, but rather losing is a valid strategy to beat the boss / solve the problem.
On the facade, the heroine still saves the day, but deep down the heroine is a pervert. And the heroine enjoys saving the world by (secretly) fucking with the enemy.

Games with similar feature, but not quite:
Kamikaze Kommittee Ouka RPG (and the games from the same developer)
Although there are defeat routes, losing makes the situation worse and Ouka will not be seen as a heroine after losing.

Karryn's Prison
Sure Karryn can beat the enemy by sex but the story doesn't really reflect on that. Karryn is more of a prison slut than a slut in prison fight.

 

[Pretentious Goblin]

SKA has some sex with major villains. Some of it is late in the game as part of the Earth corruption arc, some in the mid-late game in Roya, which is not required but comes with good rewards.