Laying some groundwork first.

"At any rate, fight me Megumin!" Yunyun demanded, getting into a stance.

"Alright sure," Megumin replied. "What kind of competition do you want this time?"

"Wait, I got a good one," Kazuma replied. "How about the first one to beat me at anything wins?" he suggested.

"...eh?" Megumin and Yunyun asked simultaneously.

"That's right, you both compete to beat me instead of each other. You can each challenge me to something once per day, unless we got something major going on, the first one to beat me at whatever challenge is the winner. A potentially long term competition. Of course, if I win, then the one of you who loses will have to do me some kind of favor of my choosing, though I will be upfront about what I want before we start, so neither of you will be signing blank checks!"

"I'm in!" Megumin nodded, already having some idea of what Kazuma was up to.

"What? But that doesn't seem... Typical..." Yunyun balked.

"Alright, feel free to back out. You'd just lose like always anyway..." Megumin sniggered.

That hooked Yunyun. "Like hell I would! Fine, you're on!"

"Good, but we'll start once we get home," Kazuma replied, wanting some privacy to use the Note on Yunyun.

"On that note, it actually IS a little unfair to her, seeing as I live with you, and am in your party, so I would have more opportunities to challenge you," Megumin noted, further helping Kazuma's game. "...hey Yunyun, do you have a place to stay yet?"

"Actually, no... I was just going to rent at an inn," Yunyun blushed.

"Perfect! You can join us, the manor has plenty of rooms!" Kazuma grinned, giving Megumin a thumbs up discreetly.

"...how did I end up getting talked into this?" Yunyun wondered aloud as the two walked off, leading the way back.