This is such a fun idea it should really be a fic so I don't have to write it LOL, but if someone does want to write it, feel free to use any and all of this, no credit required.
Nik would be so internally excited, like screaming and vibrating, but he's good at keeping it controlled, minus the clenching of his fists in rapid succession at his sides. He'd keep prying MC for more details, asking any and all questions he could. "What's it about him?" "What do you wish he'd do?" "Do you think he and Oracle are into each other?"
He'd maybe even express that he has too, to make them more comfortable.
Depending on how tipsy MC is, he might just suggest that MC try it out on him, but be like jkjk....unless.... LOL