1. Five vessels buffeted by winds dance on a storm-tossed sea: tectonic plates shift and collide beneath their feet. - Destination Unknown [Fandom: Bones]
2. The front door clicked shut. - Possession [Fandom: Bones]
3. They haven’t talked about it yet – whatever it is they’re doing on the nights when she shows up on his doorstep with a bottle of wine in her hand and a promise in her eyes. - On Your Shore [Fandom: Bones]
4. It’s the third anniversary of their rescue from the bowels of the earth. - Lessons [Fandom: Bones]
5. Booth gets the call from Russ one Sunday morning as he’s sipping his first mug of coffee and reading the funny pages in the paper. - Fine [Fandom: Bones]
6. “So you’re seeing two guys, huh?” - Bubbly [Fandom: Bones]
7. “Sweetie, I have a favor to ask you,” Angela said, slanting her a quick glance before settling on the park bench and turning the stroller to face her. - Beyond Friendship
8. Max presses a kiss to his daughter’s forehead and murmurs, “Thank you, honey.” - Recognition [Fandom: Bones]
9. With temperatures in the mid-90s, D.C. had morphed into hell. - Heaven or Hell [Fandom: Bones]
10. Jack slides from beneath Angela’s arm, escaping his dark bedroom. - Hemorrhage In My Hands [Fandom: Bones]
11. A week had passed; it was time. - Understanding [Fandom: Bones]
12. They stare, eyes heavy with pity and expectation. - No Mercy, No God [Fandom: Bones]
13. It isn’t until she’s back home, alone, staring at her reflection in her own bathroom mirror, that Brennan smiles. - Mirror, Mirror [Fandom: Bones]
14. "If you knew what I know, you’d understand." - Unsaid, Unspoken [Fandom: Bones]
15. Three years of partnership, of sharing meals, rides, and post-case euphoria and grief, and Booth navigates her moods and expressions like he’s got a Temperance Brennan atlas. - Hiding [Fandom: Bones]
16. Temperance Brennan couldn't sleep.- What Would Happen If We Kissed? [Fandom: Bones]
17. A chill breeze slithers through Sunnydale Cemetary; the perfume of grief lies thick in Angel’s nose and mouth as his eyes sketch Buffy standing watch over her mother’s freshly-dug grave. - Perfume [Fandom: Buffy the Vampire Slayer]
18. Mac admits he isn’t sleeping. - The Weight of Water [Fandom: CSI: NY]
19. “I didn’t ask you your opinion of Dr. Brennan’s character." - Clean and Detached [Fandom: Bones]
20. It’s late when he stops by. - Cast Some Light [Fandom: Bones]
Not sure I see any patterns, but I'll ponder some more. I'll come back and edit this if anything occurs to me.