[Momo tends to pick up on body language very easily, so he notes the tension but figures just maintaining his more open and approachable manner should help a bit with that. Possibly the most obvious reaction from Momo to start with, though, is the way he perks up slightly with curiosity when Keith mentions Alteans.]

I'm sure I'll find something that's not bug eventually...or maybe risk it and see if huge bug tastes any different? [He shrugs broadly, like not even he knows how willing he is to experiment with eating giant bugs.] Alteans, though? Are you from Lance and Allura's world?

[Allura mentioned two people he hadn't met when he was helping her move furniture some time ago, so he's not sure which of the two this guy is.]