She asks for a small favor while getting groped.

"Alright Yukari, would you mind sitting on my lap with your back to me?" Tsukane asked, beckoning her to do so.

"Uh, sure," she smiled, walking up in her underwear, and sitting on his lap. He then took her bra off from behind, making her give a small start, before he began to gently play with her tits. "Oh..." she moaned, blushing.

"Are your breasts sensitive?" Tsukane asked her.

"Just a little bit..." she panted. "Hey... Can I ask a favor?" she asked him.

"Go for it," he told her, pinching and lightly tweaking her nipples.

"That Sex Note thing is pretty powerful, isn't it?" she panted as he worked on her bust. "Think it could make my adult form easier to maintain, or even effortless?"

"Hmm, I might be able to outright give you the ability to switch back and forth without any drain of your energy, or at least only costing energy to initiate the switch," Tsukane mused as he squeezed her tits thoughtfully.

"Ah!" she gasped out. "Then could you do it?"

"I'll let Kurumu do it, and ONLY write that in the Note," he ordered Kurumu.

"Okay," she pouted, taking the Note.

"Wait, you're letting HER write it?" Yukari asked.

"Don't worry, she won't do anything I tell her not to," Tsukane assured Yukari.

"It's not that! I just think she'll mess it up! Can she even SPELL my name?" Yukari pouted.

"Listen here you little-!" Kurumu growled.

"Cool it you two, keep the antagonism to a minimum while we're playing at least..." Tsukane chuckled nervously.

"Yes Master," Kurumu pouted as Yukari grumbled an agreement, and Kurumu wrote down the details. Yukari blinked.

"Huh... I suddenly feel no drain on my energy to maintain this form! Awesome!" Yukari cheered.

"Well, it worked then," Tsukane grinned. "Now, what shall we do next?"