I know I have more than these, but I tried to give you my favorite few. All are Loki/Tony (except possibly To Me)
Oneshots To Me (http://archiveofourown.org/works/431422/) by Asidian The first time they forget, Loki is still a child...
Loki's Blanket (https://m.fanfiction.net/s/8620649/1/Loki-s-Blanket) By Felicity G. Silver Loki is sick and his magic is fading.
Chapter fics xE rre (http://archiveofourown.org/works/484019/chapters/842586) by Felicity GS (same person who did Loki's Blanket, but this is their AO3 account) He has always heard music. When he first spoke of it, Lady Eir explained that he was hearing magic, hearing its form and breath, that magic was simply the lifeblood of the universe and when he manipulated those melodies that he was telling the universe what he felt. That it responded to his emotion and enacted it. That he was very lucky. He did not feel lucky.
Shades of Green (https://www.fanfiction.net/s/8076759/1/Shades-of-Green) by Gemsir. Defenseless in battle, Tony finds himself getting help from an unexpected side – too bad for him, that this help causes him so much more trouble than he could have seen coming. But it causes a lot more than that.(*Hasn't been updated since Oct 2013 though)
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Oneshots
To Me (http://archiveofourown.org/works/431422/) by Asidian
The first time they forget, Loki is still a child...
Loki's Blanket (https://m.fanfiction.net/s/8620649/1/Loki-s-Blanket) By Felicity G. Silver
Loki is sick and his magic is fading.
Chapter fics
xE rre (http://archiveofourown.org/works/484019/chapters/842586) by Felicity GS (same person who did Loki's Blanket, but this is their AO3 account)
He has always heard music.
When he first spoke of it, Lady Eir explained that he was hearing magic, hearing its form and breath, that magic was simply the lifeblood of the universe and when he manipulated those melodies that he was telling the universe what he felt. That it responded to his emotion and enacted it. That he was very lucky.
He did not feel lucky.
Shades of Green (https://www.fanfiction.net/s/8076759/1/Shades-of-Green) by Gemsir.
Defenseless in battle, Tony finds himself getting help from an unexpected side – too bad for him, that this help causes him so much more trouble than he could have seen coming. But it causes a lot more than that.(*Hasn't been updated since Oct 2013 though)