Bucky was once a brainwashed Hydra agent, winter soldier and he has a metal arm. He don't get along with Tony, but then Bucky met Tony's daughter/AI. Hey name is 'Wolf' and she is human, just has an AI in her brain.

Bucky fell in love with her, shes the daughter of Tony and a model. So Wolf is beautiful and talented, also a trained assassin.

Bucky walks into the lab, seeing wolf working on the ironman suit and covered in greese and oil.