Having a threesome was Rudy's dream, and he wanted to make it true as soon as possible. However, his threesome card was locked by Rias. Since he had promised her, he couldn't break his promise.
However, that day was close as Rudy had bought a castle for his harem. Still, he couldn't hold his excitement and let out his inner thoughts whenever he thought of a threesome.
When Rudy mentioned about having a threesome with Ruby and Maria— who were blood-related half-sisters— he leaked his fetish.
Ruby shook her head and muttered, "I shouldn't have asked you that. But oh well, you are not wrong. Even though it sounds so immoral, it's a good incentive. I guess I will put some effort into making you fall for me."
"Can you not say it as though you are doing me a favor on me by making me fall for you?"