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For anyone wondering of the last panel of chapter 3, it's a flashback. Risbel was falling for Kendon in the past, when he was chief and teaching him. The one he was having sex with it's the best friend Tennian, (who we could imply from chaptwr 2 that they got that kind of relationship) but he was imagining it to be Kemdon, as if finally accepted his feelings. For what I can gather tho, at some point Kendon takes his place as chief and Risbel feels betrayed, as if all that ppl were saying about Kendon from the start (while Risbel was defending him) was always true. I'm also inclined to say that the one Kendon sees in his dreams (his crush) is Risbel. This is my theory, but I'm kind of guessing at this point that maybe Kendon did secretly caught him having sex and as vengeance, and probably pettiness, he took his tittle. Or in his mind, it was probably to show Risbel that he wasn't a lowly knight, but worthy of him, and of course, Risbel wouldn't take it like that.