His first, his last, his everything (слэш)

Tony never said anything to the other Avengers, but his meeting with Loki in Stark Tower wasn’t his first. He encountered the god one day a few years ago when Loki accidentally landed on earth. He seeked Tony’s help to find a way to go back to Asgard.
Actually Tony saw a whole other side of Loki and it hurts him a little when they meet again and Loki doesn’t seem to remember a thing about their previous encounter(s). So Tony pretends he doesn’t know Loki either just to find out later that the god really can’t remember him at all because of what the Tesseract did to him.
This video gave me the inspiration for this story: Frostiron§Gone too Soon