[ Not that Wolfram doesn't trust Axel, he certainly does, but he's definitely embarrassed of displaying how much he is being affected by all the movements and touching, so he too will try to hold sounds back through any means possible.
However, when the touching stops the demon pouts, only to follow Axel's hands with his eyes until he grabs his hips— oh, so that is what he has in mind. He smiles when he feels the Nobody's half-arousal and eager to please and also eager to keep feeling pleasurable tingles and waves, he helps Axel, rocking their hips together, meeting his hips when the other grinds up. ]