Honestly, petty demon king curses are the fucking best. Admittedly, this one looks to have been intending to turn the saintess into a generic zombie and only turned out petty because of Divine intervention, but still.
The only character I'm scared might get legitimately cucked/have their crush stolen is Rico. I am pretty sure Safi is going to be hurt because things look saucy, and she's apparently been clueless about our boy's undying love (it's the whole reason he stole the power she was supposed to have) so she'll jump to conclusions.
But the princess is absolutely looking to get in his pants/take Safi's place and the dude barely acknowledges her existence. Maybe a demonette and some mind control, but ultimately the mood looks safe.