Finn's brain shorted out when Poe kind of agreed for Finn to join him. So, of course, he followed like a puppy. Surely, surely, intentions couldn't be misconstrued in there.

Though, even on a good day, Finn had a hard time keeping up with Poe's shop talk. He mainly gathered that the booster engine was efficient and powerful, but he was more enamored with the way Poe talked about flying. Finn could listen to him ramble about it all day. "And you two designed all that? That's pretty amazing, Poe. You're a genius, you know."