It all started as an average day for both Kazuma and Aqua and that means lots of bickering and arguing from both sides.
The two had decided to stop by at Wiz's shop and after the lich had greeeted them Aqua immediately started pulling random things from the shelf. Kazuma not wanting to die a stupid unnecessary death quickly smacked her on the head yelling
"Put those back on the shelves you dont know what they do and Im not dying to find out!"
Aqua of course with her pride injured from this snapped back with
"Shut up NEET! Im a goddess you're not my Mom y'know"
This led to the two having an agrument over how Aqua should be more careful and how Kazuma isn't the boss of her.
After Kazuma makes a comment about how he's seen literal children more mature and smarter than Aqua, the blue haired goddess in retaliation drinks a random potion from the shelf and after a few seconds says
"See Kazuma I told you I knew what I was doing that potion was probably a dud anywa-"
...She passed out.
After Kazuma payed for the potion and dragged Aqua back home(and considered putting her on a diet) he dropped her right on her bed before exiting the room.
A few hours later Aqua had woken up and ignoring the greetings of both Megumin and Darkness walked up to Kazuma and greeted him with a cheerful
"Hello Mummy!"
Kazuma quickly tried to regain his fleeting composure before letting out a shaky
"W-Whoa s-slow down Aqua I am NOT your Mummy!"
Aqua gave him a confused look before replying
"But your my Mummy?"
Kazuma losing his patience yelled
"SINCE WHEN!!!!!"
Aqua shooken up by her "Mummy" yelling out her started crying before saying
"WAHHHHH YOU'VE BEEN MY MUMMY SINCE LIKE FOREVER!!!!!"
Kazuma now not wanting to make a scene or attract the attention of Megumin or Darkness whispered to Aqua
"Fine I am your Mummy now be a good little goddess and please stop crying now"
Aqua immediately stops crying and lets out a happy cheer before walking away to do Gods know what, and Kazuma lets out a sigh recognizing it's going to be a long day.