He wasn't upset to not hear her say it back yet. He wasn't expecting it. Actually, he wasn't expecting to say it himself, but he supposed that if they were doing feelings today then he might as well do all of them. Go big or go home.
Her response left him feeling a bit unsure, but Illya tried to remain steady. His hand moved from her jaw down to her neck where he pulled her in gently towards him. Being so tall, her head barely fit in the crook of his neck. "I felt it, yes, but I wanted to hear it from you. Do you think that we can try to be together? Slowly, if you would prefer that. I want to make you happy."