@CronosusCZ I think the older sister made her get used to being banged by animals, at least that's what the last frame implicates with the bed/dog/missing lower clothes/asking if she took a shower first.
@migh The serialized version of this is practically the same manga, only difference being the slightly different chapter organization (ch35 of serialized is this one's ch37) and that it includes the "True" chapters which will be released as 1.x and 2.x. Also "serialized" doesn't even have the manga's ending, the closest to that is Chapter 1 Returns, kind of a retelling but slightly different with 19 pages
@SL4MCH1N0 Not willingly at least, a decent amount of the jokes in here are referring to hentai developments after female knights get captured + put through humiliation (like whenever the teacher goes "kill me!"). So I guess the punchline here is that she was taught to just stay away because as long as you're not captured nobody can force the dogs on you. Definitely still weird though.