I'll Give You Gifts Until You Know My Name (слэш)

Mr. Stark is an extravagant gift-giver: he has the money for it, after all. As Iron Man, Tony has the opportunity to gift Steve even more presents that, while less expensive, are more heartfelt. Having a secret identity means Tony gets to have his cake and eat it too when it comes to showering Steve with presents.
Until Steve starts developing feelings for his armored companion, and all the benefits of living a double life are turned on their head for Tony Stark.