Neville's words of understanding did seem to soothe him a little. He gave a sort of half smile and a nod. He wasn't entirely certain what a green house was, other than the literal translation, but he understood the sentiment and it made him feel much less foolish. Safety. Perhaps that was part of it.
Then Neville went on to talk about some herbal remedy that he had, and once he'd clicked, Enjolras felt torn between wanting to cry and wanting to kiss him.
"Oh, merci, yes -" he started quite eagerly. "I had been thinking that I will have to ask Dr Cuddy if it doesn't..." he trailed off. He appreciated that Neville hadn't outright said what he had to be guessing at. He seemed to get it. Perhaps the man had troubled memories of his own. "Uh... if it doesn't get better," he finished, having thought of a way to say it without actually saying it.