It would be a difficult thing to resist smiling when she confesses to wanting so much, to wanting more. So, Vergil puts no effort into it, and allows himself to be simply pleased by Mizu's greediness. He doesn't need the confirmation from her that she desires the physical marks of his affection upon her. If Mizu did not like it, she simply wouldn't allow for it. Or if she was at least willing to entertain the act of creating them, but did not wish for the bruises to linger, she would use her healing factor to make it as though they never were. But he still likes to hear her say it.

"Your attempts have not been unwelcome," he says, the hand upon her thigh tracing along the outside of it to her knee before returning along the top of it until he very nearly meets her pelvis. It's a slow, soothing touch. Vergil knows it often frustrates Mizu to no end that his own healing factor prevents her from leaving such physical reminders of her affection, proof of their connection to one another. Would that Vergil could, he would slow his own healing for the sole purpose of allowing her marks to linger for longer. But his ability is not like hers. He cannot target specific injuries and leave the rest alone. His body naturally seeks to heal the most significant damage. He would not likely be in the position to allow for her marks if his body were to ignore them. But he does still enjoy the sensations just the same as her if nothing else. "But I am not without you simply because you have not been able to leave a visible mark. I have your scent and you occupy no small part of my mind when we are apart."