"I want to know exactly what kind of world produces a foul essence like yours"
A little offended but still very afraid you tell her everything about your world, how there are men as well as women, how they need to have sex with each other to reproduce, how people seem to age a lot faster and finally how magic is (at least as far as you know) rare and well hidden. How you only managed to find this mirror by pure coincidence and were still experimenting to see how it worked. By the end of your explaination she seems shocked.
After taking some time to dwell on your explaination (while still in her full intimidating goddess form) she looks at you and says "Never in my entire existence could I have imagined a world so awful." she looked down at you like a deformed worm. "I had hoped the masculine energy I found within Akko-tan's soul was fostered by a warlock who had cultivated it for many seasons, but you claim that half of the inhabitants of this world bear your curse? That even the women regularly get sick and die? That for your race to survive they must -" a look of naked disgust flashes across Aisuru's face "...copulate..." her expression dragged itself back to merely pity "...to reproduce? That an ambient filth pervades even your air such that you must regularly clean even magical artifacts?"
You nod, scared at what she might do to halt your 'corruption'.
"I truly do fear what damage you may have done already to my precious Akko but after hearing that the people of your world imagine one like ours as a fantasy worthy of documenting in extended detail, I am willing to give you a choice. I will stop the wards blocking you from saying your true name and let you leave Akko's body. You may either leave this world, never to return, while I construct a great seal to prevent masculine forces like you from ever entering again."
"Or" she begins to smile for the first time since she appeared at the door "you leave and attempt to possess me. My bountiful soul is far stronger than yours, even with the assistance of this enchanted mirror, so I will not be corrupted. However, it will still form a direct connection between our souls, allowing me to directly purge the masculinity from your soul and reforge you into a wonderful vessel of love and joy like Akko. From there you will serve as my disciple and work to purify the corruption of others as I have done for you, as penance for assaulting the very soul of the one I hold most dear."
You think deeply, this might be the most impactful choice you've ever made, reaching far beyond Mist Hollow.
"So what will it be, worm! Will you wriggle away or transform into something beautiful?"