In which Derek tries not to think about his feelings, Stiles is incredibly tired, and their road trip home together is waylaid by a blizzard.

Movement across the table drew his gaze automatically. Leonard - Bones, his Bones - sighed, wiped a hand over his face, and stood up. Without a word, he pulled at the ring on his finger, setting it down in front of Jim gently. Then he walked away. That was it. Five years, eight months, one week and six days - dissolved. Divorce finalised.

Pavel Chekov is just the weird kid who helps steer the ship, and Len McCoy's happy to leave it like that. When a late-night visit to sickbay forces him to see Chekov as more, it sets McCoy on a path he never would have anticipated.