"Your cells are performing perfect cellular replication. It's incredible. Absolutely no derogation at all, 100% carbon copies" The scientist says.
"I-… I'm not quite sure I understand, Dr" Steve says.
"The serum has basically given you immortality. As far as we can tell, you're going to live forever, Captain" They say.
"Oh," Steve says.
The scientist doesn't seem to notice. "Think of all the things we could do, could cure, if we're able to isolate the serum from your blood"
"Sorry, I- I got to go" Steve stammers, pushing himself out of the chair.
"But wait!" The scientist cries. "We need to do more testing. Take more samples. This could change so many people's lives for the better, Captain"
"Later," Steve says, already out the door.
Immortal.
Steve bites down on his lip as he runs for the stairwell, not caring if anyone saw him. Tears threaten to spill from his eyes.
When he is in the privacy of the stairwell he allows himself to cry.
Steve wraps his arms around himself. He was going to experience his bond break as his soulmate dies.
God, he was going to outlive Tony.
He doesn't think he's strong enough to survive that.
The End
Notes: For the SteveTony Games Angst vs Fluff Bingo "Growing Old Together" [O1] (Team Angst)
Bonus: Soulmates