Four parts so far, on AO3. Not mine but brilliant so I thought I would share.
Only the fourth chapter is frostiron, but I suppose it could be read as a one-shot if you don’t care for the rest. The first three chapters are great as well though, they are about Thor and Loki working on their issues with a therapist. No Thorki, though. TW for BDSM themes in the fourth chapter.
Here is the author’s summary : “Four times Loki and Tony went out, and one time they stayed in. “Can you still do that teleportation thing?” Stark asks. “Because everyone I know hates small plates and I need someone to go to this new restaurant with me.”