Get her naked and play with her.

"Nice, rip off your skirt and bottoms too!" Kurumu cheered.

"Okay," Ichinose replied as her hands immediately went to her skirt, tearing the waistband until it was useless, and let it fall, then she broke the strings of her bikini bottom, and got up just long enough to step out of the ruined clothes, and knelt again.

"How is she going to get back to her dorm?" Tsukane then asked, finding the moment hot, but realizing a small problem, even as he undressed.

"Meh, she can just walk back naked and toss the clothes in a bin in the way, it's cloudy enough that the moon shouldn't illuminate her too much, even if it's almost full..." Kurumu shrugged, taking off her own shirt.

Moka watched, but abstained from undressing for now, as she wasn't ready for participating that much in active sex, other than a few requests from Tsukane like when he asked her to eat Kurumu out, and they weren't doing a lesson that would compel her to get in her underwear.

Soon, Kurumu, Ichinose, and Tsukane were all naked, and Kurumu looked around, before saying, "Too bad these dorm rooms aren't big enough for a large aquarium, we could have totally kept Ichinose as a pet in one," she teased, and Tsukane blushed along with Ichinose, the latter of whom found the idea turning her on more than it should.

"But what should I have her do for now?" Tsukane asked, wondering, still a bit new to the whole Master and sex slaves thing. But Kurumu was always willing to lend a hand to help him dominate his new toys.

"Ichinose... Crawl over here," Kurumu crooned.

"Alright..." she replied, getting on all fours and doing so.

"Oh, and in private, call Moka and I Mistress, and Tsukane-kun here Master..." Kurumu purred, leaning on Tsukane, and guiding one of his hands to her boobs.

"Yes Mistress," Ichinose said as she reached them, and stayed on all fours for further instructions.

"Now then... To start your punishment, and show your devotion to your new owner... Worship his feet," Kurumu grinned, getting a sputter out of Tsukane.

"At once Mistress!" Ichinose eagerly replied, before she started kissing Tsukane's foot, and licking at his toes between kisses.

"Kurumu!" Tsukane chided her quietly.

"Yes Master?" Kurumu asked innocently. "Did you want me to join her?" she then asked hopefully.

"N-no, I'm just not into foot play!" he said. "And this might be a bit much anyway..."

"Maybe not the foot play itself... But admit it, how hot is it seeing just how happy she is doing something so degrading without caring as long as it pleases you?" Kurumu purred, which brought a blush and contemplative look to Tsukane's face as he looked down. Indeed, despite the fact that Ichinose wasn't getting any kind of stimulation from it, and was doing something generally considered humiliating, she looked like she was having the time of her life.

"...you know what?" he conceded. "Why DON'T you join her?"

"Thank you Master!" Kurumu chirped, happy to receive an order to follow, and quickly got on all fours next to Ichinose to lavish his other foot. Seemed Moka wasn't the only one who'd be corrupted little by little by the slutty succubus.