Tony pretends to be an alpha. Then he forgets he had been pretending. One thing he remembers is Steve. Steve tries to help out in his old fashioned, ethically strict way. Tony likes making big gestures. He has never been subtle.
It starts with a sandwich (ham and cheese, to be exact) and ends with a confession in bed. Steve's not sure what's going on here, but he thinks "instincts made him do it" is probably not a valid excuse.