Well, from some perspective you could say that ok he got alot further in previous chapter but for one it was forced, and for two it was with someone he doesn't like, that's kinda different between laying down with a paid sex worker and a lover. So in his mind you can imagine the impact being different, it also serve the comedy aspect i guess ahah.
I saw this coming from a mile away with this knight girl ahah, also no way someone with such toned muscle would have such a chest without surgery, thanks manga physics xD, it indeed screemed "female knight" trope, i even had an abs comparison run by foly in my head while reading this chapter ahah.
Anyway love this manga, keep them coming ;-)