Once the mc finds out that his sister can isekai herself back hes probably going to always stay away from women so that they don't get killed and so that there is a smaller chance of meeting his sister... but what if she became a dude instead and then rapes him as a dude. :l Either way I'm pretty sure that the elf teacher is gonna die along with the childhood friend. And the gang of bandits or whatever's leader is probably his sister.
Once the mc finds out that his sister can isekai herself back hes probably going to always stay away from women so that they don't get killed and so that there is a smaller chance of meeting his sister... but what if she became a dude instead and then rapes him as a dude. :l Either way I'm pretty sure that the elf teacher is gonna die along with the childhood friend. And the gang of bandits or whatever's leader is probably his sister.