@Jorelm - that's what it's like to be a man. Whether you want it or not, you have sexual desires. Occasionally you have to fight them because you have morals and other reasons.
It's nice to think people should be beings of pure thought, but we aren't. Your expectation for Satou to not feel anything in this situation is unrealistic, unless Satou himself is in a tense situation that overrides his sexual desires. Normally you would expect an easier victory for the angel, but Satou finds Karina to be very physically attractive.
@Flavor25 - nope. As soon as he saved one female knight, two others showed up. As soon as he entered a town, an inn's daughter used her charms on him. But this story is at its best when it features Pochi and Tama's cuteness.
I wonder if that "main heroine" from the WN will have a bigger role in the LN and manga.