Mikey laughs. "I'm not a Potions professional or even much of a drinker so it can't be any worse than anything I would mix myself. But if it does explode, I'll make sure to come after you, wand blazing of course," and he gives a grin.
He has to clamp down on the urge to reach out his hand for shaking at Spencer's introduction - mostly because he's pretty sure it's more of a desire to iniate contact on his part rather than inbuilt politeness.
"Mikey," he offers back. "And Merlin, it's so nice to call someone something that doesn't begin with Professor. It's been making me feel far too old."