Imagine Person C of your OT3 being blindfolded and handcuffed to the bed while Person A and Person B take turns kissing and touching them. Person C has to guess who’s doing what, and it ends with the three of them making love and cuddling afterwards.
Stark Spangled Banner Headcanon #10
Tony and Bruce had been dating for a while before Tony realized Bruce was interested in Steve. When Tony confronted him about it, Bruce was afraid that he’d ruined what the two of them had. However, Tony merely teased the doctor about checking out the Captain when he thought no one was looking, and then suggested they mutually ask Steve out on a date.
Stark Spangled Banner Headcanon #14
Steve is secretly terrified of waking up one day and finding that either Bruce or Tony (or both) have started to grow old, because he never will and he’s mortified of the thought of being left on his own again. When Tony and Bruce found out about this they started planning a way to possibly accelerate Steve’s aging so that he’d never have to. They’re still working on it.
Stark Spangeld Banner Headcanon #82
Tony and Steve fight the most in the relationship, but the worst fights are usually with Bruce. He doesn’t Hulk out, but he leaves without notice for days on end. This hurts Steve and Tony more than the Hulk ever could.
Stark Spangled Banner Headcanon #18
One of Tony and Bruce’s favorite things to do in bed is to write equations and schematics onto Steve’s skin with edible markers and then lick every bit of color off.
If you watch White Collar and don’t ship Neal/Peter/El, then I’m sorry, but you are wrong.