1. He was so scared that day that he can't remember how it felt the first time, but the second time he takes Rey's hand, Finn feels the strangest sense of home and belonging. It makes him never want to let go.
2. While he sleeps, Finn dreams of hot sands and a bright smile that eclipsed Jakku's too-hot sun.
(And I see you like FF VII, so here's a bit of that, too!)
3. After Sephiroth's return and Geostigma, they're all the same but different. Cloud is still too quiet and too likely to spend days alone, but now when Tifa calls and says that dinner is ready, he comes home.
She would do everything again, just for that.