Here are a few of my favourite Loki/Grandmaster fics! My tastes for this pairing tend to skew to the darker end of things, so blanket dubcon/noncon warning for all of these.
one for the money, two for the show, by Lise (7k) - literally everything Lise has written for this pairing is great, but I especially love this one, featuring Loki thrust into a very anxiety-provoking roleplay situation
Survival Mode, by thespectaclesofthor (22k) - iirc this was the fic that got me into this pairing when I was casually browsing Thor fic after Ragnarok? it's long and iddy and wonderful--it's a WIP but it can totally be read as-is because it's just glorious PWP
Sodden, by MostFacinorous (4k) - just a short and not-so-sweet PWP featuring cum play and lots of humiliation
Trust Me, by spockandawe (8k) - wax play, an especially cruel use of gags, horrifyingly dubious consent, and a superb Jeff Goldblum voice
Ascension, From a Certain Angle, by Tandirra (7k) - I love the gradually escalating aura of menace in this fic, as Loki tries, increasingly desperately, to play hard to get
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one for the money, two for the show, by
Survival Mode, by
Sodden, by
Trust Me, by
Ascension, From a Certain Angle, by
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