Mutual ownership.

"...so... We both essentially have a claim to ownership over each other?" Issei asked, carefully considering what to do with this information.

"That is correct, Master..." Rias nodded. "But the Lamp's got more power than the Devil Peerage system..."

"...still, you know better than I would how best to manage the... Peerage, right?" Issei asked as he scratched his head thoughtfully, completely forgetting about his nudity for the moment. Rias took the opportunity to look his body over some more and imagine all the ways she wanted to let him ravish her. "Not to mention Devil politics?"

"Correct, Master... So...?" she asked, curious as to what he was getting at.

He clapped his hands together, and smiled at her. "Alright, then it's settled!" he declared. "You'll be my sexual servant, but in all other matters, I'll defer to you. You'll essentially be my boss in all serious matters, and behind closed doors, my sex ****! Well, as much as the term "****" actually applies." He looked extremely excited at the prospect.

Rias blinked. She had honestly expected him to assert full dominance... Not that she would have minded if he had, but it definitely showed he had more depth to him than simply being a pervert. Her genie side was almost disappointed, but the part of her that was still fully Rias was pleased. "That's a wise choice, Master! So, shall we get to it?" she asked, immediately pulling off her top, and freeing her boobs.

"...I'm actually having trouble deciding if they look better out of that top than in it," he admitted, his nose bleeding, making her giggle behind her veil.

"Good, then it was doing its job!" she replied, cupping her breasts with her hands and pushing them up, increasing their visual appeal. She delighted in his enjoyment at seeing them, bordering on... Her thoughts was cut off by him reaching forward to grope her, making her moan in delight. Scratch that, it was completely obsessed! And she certainly loved it!

"They're wonderful..." he breathed reverently.

"Yes... They are..." she crooned, closing her eyes, simply enjoying her Master's touch.