Thor/MCU Loki centered fic where he was stuck as a child on Jotunheim

He was in the form of a child and i think it was his Jotun form and trapped for awhile due to weather that had everyone underground and was learning magic/sharing his magic skills with the adults. At one point there was a journey to the surface were i think he disappeared after.

Possibly part of it or a different fic was him getting kidnapped by someone and wrapped up in furs and traveling on the back of a vehicle maybe with thor or another kid but he was treated very considerately and kindly.

I think it was Gen on ao3.