If Selwyn thought Daphne was going to let her win, then she had another thing coming.
Drabble. Harry convinces Daphne to go on a muggle ride. It doesn't go well.
Hanahaki Disease AU. Harry Potter was going to be the death of her, though Daphne Greengrass doubted either of them counted on death by heartbreak. Still she has to choose between giving up her love or dying, or does she? Love is Harry's greatest power after all. Angst with a happy ending.
"Maybe this is why Slytherins shouldn't try and be noble. We're just not good at it." Harry and Daphne were meant to be married due to a contract; she let him go and dealt with the consequences on her own. Five years later, he learned what those consequences were and is determined to help her.
Harry Potter rescues a fox that is more than meets the eye, not accounting for the woman that comes with it.
Third Year. The boggart lesson makes Daphne Greengrass come face to face with something she'd rather not think about. Even worse it happened in front of all of her classmates. She is not in a good mood but a conversation with Harry Potter unexpectedly makes her feel a bit better.
Eighth year; de-aging. After a joke has unintended side-effects, Harry ends up helping to take care of an effected Daphne Greengrass. And finds himself unexpectedly missing the normal Daphne.
Soulmate, noun: a person ideally suited to another as a close friend or romantic partner. In reality: a complete and utter disaster. Draco Malfoy/Hermione Granger, Ron Weasley/Pansy Parkinson, Harry Potter/Daphne Greengrass. Others.
In a push for inter-house unity, a pen pal program is established at Hogwarts. The rules are: no one within the same house is each other's pen pal, no one knows the actual identity of their pen pal, no one can admit their identity during the program, and not even the eighth years are spared this. No one thinks this will work, and yet they actually start making an effort.