Snuggles, Thor/Bucky
Bucky's not a person that enjoys being touched, too much emotional trauma associated with having someone else touching him to blame the guy, and snuggling is out of the question, he usually feels too trapped to even get any enjoyment out of it.
While Thor loves to do things like hold hands, or have Bucky close, he understands the negative feelings associated with those kinds of things, and usually lets Bucky control what happens, so he doesn't overstep and set off Bucky's PTSD.
Everything changes at night.
Once he's asleep, Bucky holds onto Thor like his life depends on it, he pushes his head under Thor's chin, and if anyone but Thor was the victim of this violent cuddling they would wake up with bruises, or, if Bucky has a particularly bad nightmare, possibly broken bones.
Thor doesn't mind in the least, he knows Bucky has nightmares almost every night, but he claims that since Thor and him had begun sharing a bed they're nowhere near as bad as before.
When Bucky wakes up and sees that he's clinging to Thor he'll quickly let go, but not move away, because it's warm this close to the God Of Thunder, and their room is cold in the morning.