Fine I'll do it myself. (They're all dean centric sorry)
Henry and Dean hate fucking over John. "HOW DARE YOU ABANDON MY FATHER???" which is retaliated with "HOW DARE YOU LET MY SON DIE??" (Both of them are misunderstanding each other)
Add some classism. "No grandson of mine is a filthy hunter!!1!1!" *proceeds to fuck the soul out of him*
Or that one time when Dean was acting tsundere and ignored his handshake? DISRESPECT! Time to teach him how to respect his elders (and by teaching he means fucking him into the motel room mattress)
Wholesome headcanons? Henry hums 'As time goes by' to Dean after their marathon sex. Dean feels safe like he did as a kid and gets the best sleep in like, forever.
Weirdcest? They fangirl over John's childhood photos/memories. Dean pulls out john's adulthood photos out of his breast pocket
Full house?? Dean tells him what he and John used to do and Henry gets off on it. They try to roleplay it with each other.
ANGSTTT???? Dean breaks down into Henry's arms, crying. He wants his dad. This is not dad. No matter how similar the man is, no will ever fill his 'dad shaped hole'.
Etc. I can't think of any samhenry ones yet because I believe their relationship is wayyyyyyy complex than just plain fucking.
