We’ve got a fair amount of Steve caring for Bucky after HYDRA trash: so let’s have the reverse. After HYDRA does whatever trashy thing(s) to a captured Steve that filler wants (gangbang, medical experiments, torture, any combination of all of these, etc.), he’s rescued (and/or accompanied in his captivity by, your call) by the Winter Soldier. The Soldier tries to offer help in whatever way he can, influenced by his own memories of what was done to him. Some ideas:

-The Winter Soldier awkwardly but earnestly trying to care for Steve, based on his limited memories of comfort/the kinds of things he wished his handlers would do for him/his methods of soothing himself.
-The situation triggering the Soldier’s own panic responses
-Things the Soldier thinks are helpful actually retraumatizing Steve
-Steve trying to hide what’s happened to him but the Soldier finding out/intuiting it anyway
-Steve in crisis mode, still unsure whether the Soldier is an enemy or not
-Someone else stumbles on the whole situation and thinks the Soldier did this to Steve