Hulk Gets a Present , or, Another use for a custom rabbit.
They Say He Was A Soldier, From the Great Patriotic War, an MCU/Man from UNCLE crossover about young KGB Agent Illya meeting the Winter Soldier. The setting is pre-Man From UNCLE, so WS is in a dark place here and not going to be out of it for a long time, but the fic describes a relatively pleasant interlude in his bleak existence.
Stupid Spoiled Whore Video Playset. In an A/B/O universe, Omega Tony Stark is the subject of a certain South Park episode. The other Avengers are not amused. (Also known as, that one time Alex wrote A/B/O. I do not share this kink, so I'm unsure how well I've represented it, but some people on the kinkmeme liked it.)