What You Don't Know Won't Hurt You (слэш)

For the prompt from LauraKaye:
AU: Tony's secretly an empath, and when he encounters Bucky--could be same time as canon, could be much earlier--what he senses from him is so awful that he can't bear not to try to help.
Concept: Bucky is a giant nerd. He loves science and machines and space, and as he recovers those parts of himself he realizes that he's LIVING IN THE FUTURE and it's SO COOL. The coolest thing he's seen so far? The Iron Man suit.