Fics like Four's a Crowd

In an alternate universe, Tony Stark never came out as Iron Man, even to his teammates. Sometime after CA:WS, Bucky comes to the tower, regains his memory, and rekindles his relationship with Steve. A year later, Steve and Bucky realize neither of them have ever had sex with anyone else, and they probably won’t if they keep their relationship monogamous. When they decide they want to explore, Bucky decides to ask Tony for a one night stand, and Steve decides to ask Iron Man. Both of them bite off more than they can chew, as they both discover that they’re in love with their extracurricular lover - while still being madly in love with each other. Tony just hopes it’s all worth it, because if they ever find out it was him with both of them, he’s pretty sure they’ll never want to see him again.

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