In the triad relationship of course its gotta be Stuckony. Ever since Steve had got all serumed up Bucky's missed his little spoon so imagine his surprise when his Stevie went and got himself his own little spoon. Tony is the little spoon in the super soldier sandwich relationship. Both supers love holding, carrying, taking care of their teeny tiny boyfriend. But every once in awhile Tony will sqwack that he's not small, that he is perfectly normal size and that its not his fault they are tall.
If I’m ever gonna die of a fluff overdoes, it’ll be headcanons like this one. Tony being cuddled by his supersoldiers is my weakness, alright? Tony being cuddled in general is my weakness, so just. All the affection for Tony please. Especially when he’s tired, or so hyped up on brittle anger, frustration, helplessness that he can’t, physically can’t, sit still for even a moment, and Steve or Bucky just- hold him. Anchor him.
It works both ways too: Sometimes when Bucky or Steve have a bad day, a really bad day, they’ll seek out Tony and hold on to him, let him anchor them. Bucky tends to scoop him up and carry him off into a corner where they’re locked away from the world, while Steve prefers the living room, with as many other sounds and people around as possible–the most important being Tony in his lap or cuddled against his side.
And sometimes, when Tony’s not-yet-fully-woken-up, he just rolls over and nuzzles against the closest source of warmth he finds–and neither of his boyfriends can do anything but indulge him with more cuddles. This may or may not be the surest way to keep Steve from getting up for his morning run–one Bucky may or may not abuse shamelessly.
(And yup, his height is a bit of a sore spot, sometimes. Unless the magic power ray misses him and hits everyone else in the face. Then he has no trouble at all mocking them–after it’s been confirmed that the bright, neon coloured hair really is the only side-effect and there’s no lasting damage, that is.)