oh i love when a story makes this little father son rivalry over the mother, its so cute
i also still like ain, hes a kid who grew up in what i assume is a family with a strictly work related bond as a duke
so i would expect him to be really starved for affection so he tries to act cute to get as much love as he can
i also get the same vibes from the duke but since hes an adult i would assume he has suppressed the need for love