Part 1 of The Great Subconscious Club by Mikkeneko.
Written for the Norsekink prompt:
"SHIELD has Loki in custody, with the gag on to keep him from spellcasting, but they don't really know what to DO with him. They can't give him food or water or attempt to interrogate him with the gag on, and they don't dare take it off. Their solution? Call in a telepath! But Charles Xavier may find more things in Loki's head than SHIELD bargained for..."
Originally posted at https://archiveofourown.org/works/516232