Ryu didn't say much to these words. His perspective on having multiple wives had already changed long ago, the moment he leapt over the hurdle he and Elena had faced.
He was Ryu Tatsuya. He believed that his destiny was to stand at the very top of the world. Not just any woman was worthy to stand by his side. However, those that would earn such a right, he wouldn't allow to suffer even the slightest grievance.
Originally, his plan was to remain with one woman for the length of his life. Even when he met Ailsa, that held true and he didn't waver… At least not initially.
The Heavens of Sacrum, though, had a different plan for him. Ailsa had done too much for him, given too much to him, for him to simply ignore her. Like this, his first love might have been Elena, but his second true love was Ailsa.