Their roles. Was it possible for roles to change as drastically as Malleus suspects he might want? He thinks of the kiss earlier, and of how Lilia's hips had felt against his own. And again, Lilia mentions when Malleus was small, though it is true that the Lilia now is distinct from the Lilia then.

Malleus suddenly looks rather sullen, though he tries to shake it off.

"It is rather unfair of you to continue to mention the time when I was small." Embarrassing, even, and it makes Malleus feel worse about the way his body had reacted earlier.