Opening the door you were met with the goddess of love, Aisuru. On the first look you wouldn't expect this woman in casual jogger’s attire to be a powerful goddess (which was kind of the point). The most eye-catching features were her massive boobs and childbearing hips, which are quite fitting for an embodiment of love. The swimsuit episode came to mind again. She had her blonde hair in a braid that went over her shoulder and was one of those characters, who kept their eyes perpetually closed.
As Akko’s parents never appeared, Aisuru was probably the closest to a mother-figure Akko had in this manga. If Akko had a problem she couldn't solve, this unassuming jogger, unlike the readers Akko herself was unaware of her real identity, would cross her path, listen to her woes and give helpful advice. Occasionally she would pull some strings in hopes it would bring Akko and someone else together. Though she didn't seem to play any favorites in that regard. Her only goal seemed to be Akko finding love and if she had romantic feelings for Akko, she wasn't showing it.
Because of that it seemed odd for Aisuru to be standing in Akko’s doorway. From the top of your head you couldn't remember any chapter starting that way. Did Akko ever tell her where she lived? Otherwise she’s risking her cover right now. Better to play it safe.
“Good morning, Aisuru-san. What a surprise to see you here,” you said in what you hoped was your best Akko-impression.
“Spare me this mockery, you foul changeling,” Aisuru replied uncharacteristically coldly.
“Eh?”
You backed away as Aisuru slowly walked inside. The door closed on its own behind her. In a blinding flash the top and track pants were replaced with ethereal robes and she started floating several inches over the ground.
“Eh?!”
“I will only say this once, so listen closely, evil bodysnatcher. What have you done to my dear Akko?” Aisuru loomed over you as she finally opened her eyes. It might be a cliche, but you knew that, if this type of character opens their eyes, things won't end well. And somehow she managed to make pink, heart-shaped irises look threatening.
You saw your life flash in front of you. You were aware that there was only one way to get out of this situation, or rather this world, alive. “Akko Uzikari,” you shouted your name. “Huh?! Akko Uzikari! W-What? But?”
“I felt the energy of a magical artifact followed by Akko’s pure soul being overwritten by something else,” Aisuru explained. “Considering I can't make out any artifacts in the area, I assumed it could be activated remotely over long distances. Hence why I blocked your ability to say your real name. And now you will tell me what you used and hope it doesn't have any lasting aftereffects for Akko.”
With an angry goddess in front of you, you had no other choice but to spill the beans on everything involving the mirror. You even went so far as to tell her about this world being a manga, though that didn't seem to surprise her. Once you finished she spoke up, “Interesting, I have already dealt with artifacts with similar abilities, but not a mirror, yet. And especially not one that allows crossing the boundaries between worlds. I’ll definitely have to look further into this.”
Then she directly addressed you again. “Now regarding you. I’ll give you the benefit of the doubt and assume you didn't plan to do anything evil with Akko's body. Therefore I’ll let you go… if you do me a favor. Do you agree?”
Faced with either the wrath of a goddess or doing her a little favor, you obviously chose the latter and nodded. Yuri Days is a simple manga, so what's the worst she could want from you?