Ignis can't stop him if that's what he wants to do. He's truthfully grateful how much Prompto has stepped up to help without even the slightest complaint, which makes him feel guilty for feeling so stifled by it. The other man just wants to support him, which is only a reminder of how much he has lost, even if he doesn't regret his choice.

"If you could lay out my clothes on my bed, please," Ignis offers after a moment of thought. "I can handle the rest."

He hates the amount of privacy he's lost as well, but he's now only uncomfortable about being naked around Prompto. Even while camping, he had kept his privacy. That became impossible the first few days after the fight on the altar when he was too weak to walk without help. But again, Prompto had helped him without complaint, and Prompto had made him feel safe while so vulnerable. It was something he could live with for now.