Darkness and Megumin show up.

"Hey Master, we're ready for some fun tonight!" Darkness announced as she and Megumin basically barged right into his room.

Kazuma turned and Rin peeked around him curiously as the two stopped and stared in. "Are we interrupting something?" Megumin asked with a quirked eyebrow.

"Actually no, you two can join in," Kazuma grinned, and the two beamed as they started undressing, Darkness closing the door.

"Why did she call you Master?" Rin asked Kazuma curiously.

"Oh, we're his sex slaves," Megumin answered way too casually. "Don't worry, we don't mind it at all, we quite enjoy the dynamic."

"...oh..." Rin nodded, finding the idea actually pretty hot without inhibitions to have her questioning it.

"Where's Aqua at?" Kazuma then asked the two.

"Oh, she's... Busy," Darkness shrugged, and Kazuma nodded, getting the idea. Ria must have snagged her up since he wasn't currently using her, and he HAD said that she could play with Aqua whenever he wasn't or they weren't on quests.

...

"You're so insatiable Mistress," Aqua moaned as she and Ria scissored. "Didn't you just play with three of the boy toys Kazuma gave you?"

"Well yes, but they came too fast, I haven't trained them yet," Ria shrugged. "Just going to have to work on their endurance I guess..."

"Oh..." Aqua crooned. It was an interesting dynamic now, with the two bickering whenever she wasn't currently submitting to Ria. Pretty similar with her and Kazuma actually..."

...

"Regardless, the three of us should be enough to satisfy you for one night Master," Darkness cooed, walking up to Rin, before leaning forward to lick as her abdomen, licking up the spurt of seed Kazuma had released there, causing Rin to shudder in arousal.