The characters in the story are fully grown both physically and mentally.
うーん、良牙とちょっとやりすぎちゃったかな。とりあえず、風呂に入ろう…あれ?どうしたんだ?体が男に戻らないぞ?
Hmm, it seems like I overdid it a bit with Ryoga just now. Anyway, let’s take a bath first... Huh? What’s going on? My body hasn’t turned back into a man?