Oh, here's a long(ish) one.
When Ben first arrives at the Resistance base after defecting from the First Order, the hatred that fills the air is plentiful. He truly expected nothing less, considering almost everyone has lost someone they care about to the First Order. It doesn't necessarily help that he was once the Supreme Leader.
By the first month, the boiling hatred had died down a little, but the wary actions and avoidance remain. Ben doesn't mind, because if he has no one else on the base to trust him, he has Rey. And that's enough for him.
Six months pass before things start to change. It started with the short mechanic sitting down at the table he occupied alone during breakfast as Rey had been sent to retrieve intel on the First Order earlier that morning. The small woman, Rose, had been the first to even try to strike up conversation. Ben sat confused as Rose babbled on about a broken x-wing that Poe had brought back, and how it was almost completely unsalvageable. He didn't know how to react and wondered why she was even speaking to him.
He didn't realize he had spoken his thoughts out loud until Rose answered. "You seemed lonely," she shrugged. "I understand you did horrible things, but if Rey trusts you, then so will I." A grin appeared on the woman's face. "Besides, you can't be as bad as people think. I mean, I've seen you around Rey. It's like watching a cheesy romantic story. It's cute." At this, Ben's face flushed and he quickly turned his attention down to his plate, all the while listening to Rose's laughter.