Its like this was started as a light hearted "what if the comic character was self aware" and is quickly descending into existential horror as the artist realizes how much that would suck
I reckon they been fucking since the first chapter and the mark on his face is a hicky. We just never see it because this manga isnt about that, its about CAMPING.
I find it interesting that this whole dialog about a predator x prey society and the morality vs the necessity of the back ally market evolved from a manga where a wolf wants to fuck a bunny.