Beginning Yunyun's Conquest, part 1.

Flashback.

Kazuma had just gotten back from the blacksmith after learning the Smith skill, wondering what he'd make first. He was just thinking about making something to help stay warm in the winter when he was practically ambushed by Yunyun the moment he stepped into the front door of the mansion.

"Hey, has Megumin beaten you yet?" she asked, bringing up the challenge conditions with how she and Megumin were "competing" to beat him first. Of course, Megumin was actually not doing any challenging of Kazuma, it was just a ruse to play this game with Yunyun, and obviously, they weren't gonna tell her that.

"Nope, it's only been a day, so I take it you want to kick off today's match?" Kazuma smirked. "What's the wager?"

"Um... Uh..." Yunyun paused, realizing he wanted something sexual. With a blush, she suggested, "I'll let you slap my ass?"

"Done," he grinned, heading out into the yard with her in tow.

Five minutes later...

"No fair! You blew snow into my eyes!" Yunyun whined as she sat on her rear, having just been Shocked by Kazuma until she gave up, after of course, the aforementioned dirty trick.

"You should have realized I played dirty," he smirked, helping her up... And then without warning, smacking her rear through her skirt.

"Ack! Hey!" she protested. "A little warning would be nice!" That said, she blushed and smiled as she processed how much she enjoyed it. "But... Um... You can do it again if you want..."

Kazuma grinned, and obliged... Several more times.