France is going to put off the explanation of his existence for now as it tends to take up a quite a lot of time. Also, this situation isn't solely about him; this is about Envy and Lust, who France understands to be the equivalent of family. It's not often in this place that anyone gets to do anything resembling a proper meet the family moment.

At Envy's words, France places a hand on the small of Envy's back, light and gentle but clearly supportive. He doesn't lean in to kiss Envy's cheek, although Lust can probably tell from his expression of deep warmth and fondness that that is what his instinct is to do. He smiles, a broad and entirely honest thing.

"Envy's the most wonderful experience this place has and continues to give me. I assure you, I try my utmost best to be what he deserves, although he continuously and rightfully outshines me."

France is a highly affectionate pet crazy man, if you will.