It's submission and surrender that meets him this time. It's not like Akaya when he's got his wits about him. That's by design. Akaya was coming too close to self-assertion, and Yukimura needs to feel in control right now-- over the reality he faces and over Akaya himself. Never mind that all Akaya was doing was answering Yukimura's own call of passion.

He explores this mouth he's visited so many times before, mingling their tongues with a calm control. His hands glide down and come to rest at Akaya's hips; Yukimura slides his forefingers through the belt loops of his pants, and his thumbs just brush against the skin under Akaya's shirt at the waist.

It's fine like this. Akaya doesn't need to do anything back. Just so long as he doesn't fight.