chris control your goddamn face you have just gone through an extremely painful super-serum transformation you did not just have the diddly doo orgasm
…actually, at this point, Steve’s just now experiencing the sudden absence of both recent extreme pain and long-term low level pain. He’s probably so high on endorphins that the expression is completely accurate.
Also, he was asthmatic. This is the first time in twenty years that his lungs work. Ever had an oxygen high?