Captain Onesie

Steve adores the onesie. When he wears one out in public, however, he starts to trend, and it's all downhill from there. And Phil Coulson is assigned the task of tracking the captainonesie tag. He isn't paid enough for this. Disclaimer: I don't own the Avengers, or any other Marvel thingummies, nor am I making money from this. For a prompt on the kink meme. Pre-Capsicoul?