Was about to comment plot twist: The hero is gay for the sage, but then the twist plotted even more and somehow we have a crossdressing hero, a crossdressing nun and a futa.
First few page : Hmm the hero surprisingly attracted to the mage, but i don't see boys love tag anywhere
After the hero undress the armor : OH HELL YES
But kudos to author make the design not so obvious that she's a girl all along