They do, and explain the situation to him!

"Ikaros? Where have you been?" Tomoki asked her the moment they spotted him. He walked up, looking a bit frantic. "Didn't I tell you to wait outside for me to get here?" He then turned to gaze upon Mikako and Sohara, not finding their slutty harem garb unusual, but still very much enjoying the view. He was a bit surprised when they smiled at his gaze, and shifted to pose enticingly.

"Apologies Master, but something came up," Ikaros replied as Mikako held out the Lamp to him.

"...what's that? It's not going to explode or something, is it?" Tomoki questioned nervously. With Mikako, that actually was a genuine concern.

"Just take it," Mikako smirked. "And let's find somewhere more private to talk. We have something extremely important to discuss."

Tomoki hesitated, before grabbing the Lamp, before Mikako grabbed one of his hands and pulled him towards the empty classroom. Sohara walked ahead of them, making sure her ass swayed enticingly for Tomoki.

Tomoki naturally stared. The earlier wish had covered them wearing the harem outfits, making everyone see it as normal, but Tomoki was wondering why they were acting like they were trying to seduce him. They entered the classroom, and Sohara turned to grin at him as Mikako closed the door. "Rub the Lamp," she told him.

"Eh? Why? There a genie in here or something?" Tomoki asked, thinking he was being pranked or something else along those lines.

"... you're closer to the truth than you realize. There's no genie inside, but..." Mikako started, and Tomoki shrugged, and, bracing himself for whatever was going to come his way, he rubbed the Lamp. He then yelped as he spotted a trail of red mist suddenly appearing from the lamp spout, and looked up, following said trail with his eyes, and staring when he saw where it led.

"With that, you are now my Master," Sohara chirped. Her legs had dissolved immediately upon changing owners, returning to genie tail form, and connected to the Lamp spout.

"...okay, would anyone care to explain, what the hell is going on here?" Tomoki questioned, almost dropping the Lamp in surprise. Mikako and Sohara exchanged amused looks, before looking back at Tomoki, and began to explain the whole situation to him, along with Ikaros,how the Lamp had dropped out of the sky, gotten Ikaros to look for a genie for it, Mikako getting sucked in by mistake, and then swapping places with Sohara.

By the time they were done, Tomoki's head was spinning.