[Monika's doubting him. Which is understandable, as the claim might seem dubious. If anything, it goes to show how well the holoavatar look if it can trick another human into believing he's human. Aside from his lack of knowledge of human customs or food, nobody could tell that he isn't one.]

This is not my real body.

[And to prove it, he reaches his hand out to her chest and.... His arm go through her body. If Monika looks down, she'll find that the arm is somewhat see through now. Then, he pulls his arm back and it seemingly becomes solid again as he picks a chocolate and pops it into his mouth.]

It's a holographic body. Holomatter avatar... It's a hard light projection. And before you ask, I do not understand how the technology itself works.

[What point he's making is that the holographic avatar is solid. Able to interact with the surrounding. Able to feel. Able to look just as alive as the next human being. What point is having a disguise if you can't blend in with the populace, after all. Most species aren't see through.

In normal circumstances, he wouldn't let this fact known. But he isn't using this form as a disguise, but rather for convenience.]

Otherwise.... If you require more prove, we'll have to go to the parking garage.