One slight tweak, then they get started!

"I'm for all of those details," Akeno nodded as she watched Rias lean down and start making out with Issei, their bodies writhing against each other. "That said, perhaps you should add the ability to trigger that "**** Mode" a limited amount of times for free. Just in case it's not practical to satisfy my sadist side in the particular moment. After all, getting the benefits of access to Sex Genie Magic is one hell of a good deal..." She didn't mention having slight masochistic tendencies of her own, she wanted those to come out naturally in the dynamic.

"...if you're willing for that, sure," Issei wheezed, his cock beginning to pulse as he caressed Rias's back.

Rias moaned as she kept working her hips, and grinding her hips. "Let's get off, before we finalize the details," she panted, her pussy spasming around his shaft.

With a grunt of agreement, he quickly bucked his hips a few more times, and with a gasp of relief, allowed himself to erupt into Rias's pussy. Rias let out an enraptured cry as her own climax coursed through her body, her slit milking his member of every drop. She then got off of him, and sat on the bed with her slit leaking some of his semen. "I never get tired of that," Issei admitted, sitting up next to her, and kissing her cheek.

"Me either, Master," Rias grinned. Issei then wrapped his draconic arm around her, and groped her breast with it, making her moan and arch her back a bit, pushing her chest into his hand.

"Mmmnh, that was a nice show," Akeno grinned. "Of course, the question now is, how to trigger **** Mode in the secondary manner..."

"Hmmm... it could just come in Master being able to do it once every few days at will or something..." Rias mused.

"...not bad, but I'd prefer more flexibility, and perhaps a hotter activation mechanism," Akeno nodded.

"Um, I might have an idea," Asia piped up, ready to make a suggestion of her own. When the other three looked at her, she flushed, but plowed ahead, "How about making it activate automatically if Master deliberately uses Dress Break on you?"

"...oh, that sounds fun... A way of him setting me off by showing dominance," Akeno agreed.

"Are you secretly a masochist too?" Issei asked Akeno, slightly amused.

"Maybe a little bit, usually I'm more a sadist though," she admitted without shame. Issei chuckled, and turned to Rias. He proceeded to make the wish, and with a click of her fingers, the collar formed around Akeno's neck, gold with a dull amethyst encrusted in the center.

"The gem will light up with additional luster whenever her submissive side is brought out," Rias explained.

"Oh, that's a nice touch!" Akeno smirked. "So... going to take it for a spin?" she asked Issei.