
I’m only half way though volume 4 (the manga is at the at the beginning of volume 3 in the novel) and it’s not clearly stated yet. It’s stated that the younger one has grown to be about 180 cm (I think he was 168 when they met but I don’t remember how tall the older one is) and he’s also stronger than the older one (not as skilled in fighting tho, just strength). The older one has a hook up friend who he meets on and off where he’s the top, but at the moment I can’t say for sure what their preferences will be once they’re together. (I’m bad at names btw hope this gets across). My guess, given their dynamic right now, would probably be the older one bottoming for their first time because it’s ”easier” for the younger one but I could be totally wrong too. Mostly because the younger one is jealous if the older one’s ”partner” but it’s more describes as ”I wish I could give you marks like he did” rather than ”I wish you could make me feel what you make him feel” of that makes sense? Hope this way a tiny bit helpful at least.
I remember reading this in the novel and thinking ”did he really have to go that far, was there to much blood or something?” and now, after seeing it, the answer is still NO