The test goes perfectly. As the device whirrs, Tony Stark crows in triumph, flinging his arms around Bruce.
"Right now, Banner, I could..."
He doesn't finish saying it; instead, he does it. It's a beautiful kiss, one of the best of Tony's life, with Bruce's lips warm and pliant against his own.
Then he's being kissed back, not gently but hungrily. Hands clutch at his back. So, not the first time Bruce has thought about this, either.
Abruptly Bruce breaks it off, glasses fogged, mouth twisted miserably. Not angry, at least. Not the Hulk.
"I can't do this," Bruce says.