[Lucifer nods briefly, folding his arms over his chest.]

I intend to, yes. There is, naturally, a small chance that they won't cooperate.

[He's bereft of his demon charm and other such demonic powers, so cooperation isn't entirely guaranteed. They do owe him a favour, but humans are just as fickle as demons themselves.]

I won't allow anyone to offer themselves as a test subject unless we run out of options entirely, however. He was right to tell you that it's too dangerous an avenue to pursue as of right now.