Ok, I feel like this whole scenario is a genderflipped Goblin Slayer joke, and that panel near the end was definitely a Jojo's reference.
God, I love reading a series that takes its piss by the gallon and doesn't take itself seriously.
And I am calling it now - once Peter gets married, his entire harem is just going to drag his wife aside and say "we can give you a day of the week".