no-gorms:

The Trial Run (13,885 words) by scaramouche
Fandom: Marvel Cinematic Universe
Rating: Teen And Up Audiences
Relationships: Steve Rogers/Tony Stark
Additional Tags: Fake/Pretend Relationship, Getting Together, First Kiss, Humor, Flirting, Mild Angst, Tony POV, Post-Captain America: The Winter Soldier, Pre-Avengers: Age of Ultron (Movie)

Summary: Tony and Steve pretend to date, and enjoy it far more than they should.