'For future reference' Loki tells him, after whispering lewdly that he could change him back to this particular form, post successfully reverting him to full human upon Thor's return.
And post Pepper's Tony hastes and it shouldn't surprise him, how unsurprised she seemed when he'd broached the subject, when they ended things swiftly.
He crawled into Loki's bed at night and wordless the god pulled him. They eased into an embrace so swiftly as though it was most natural as though habit, and let sleep take them.