The third one.

Tsukane mentally ran over his options, having started to write Inner Moka's name, stopping at the last letter to avoid affecting her prematurely, considering each one. They all had their benefits, one allowed him to touch Moka in an intimate place with no repercussion, another allowed him to see her nude body in private, and the third would let him see her bra, in addition to her panties, any time he asked.

It took him a couple minutes, and Inner Moka snapped a bit, "Get on with it!"

"Hey, don't rush me!" Tsukane pouted. "You told me to choose wisely, of course I'm going to think about it a little!"

Inner Moka huffed, but sat next to the nude Kurumu, who was giggling. "So impatient," she teased.

"Watch it, I still have your punishment to decide for your comment earlier," Inner Moka growled.

"I could always incentivize you to keep it light," Kurumu teased, leaning towards Inner Moka, putting an arm under her bust, accentuating her breasts for the now bisexual vampire.

"...point taken," Inner Moka acknowledged with a blush.

Tsukane came to a decision, and wrote, "Moka Akashiya will open her top and expose her bra to Tsukane Aono whenever he wants, whether it be her Inner or Outer self. She will enjoy the action, and like giving him a good view."

Once he set the Note down, Inner Moka got up, and walked over to see what he had written. "Bra," he said immediately, and she paused, before reaching up, and unbuttoning her top, pulling it open to give him a view of her bra clad tits.

"...huh, wasn't quite expecting you to go for that one," she admitted, leaning forward, and giving Tsukane a good view of her chest. "You can already see my panties whenever you want, thought you might go for either of the other two."

"It completes the set," he admitted sheepishly, rubbing the back of his head.

"Indeed," she confessed, closing her top back up.