You grew up in Asgard amoung Æsir. Alongside the Gods of Thunder and Mischief no less. They've always been like big brothers to you. However, in time you start becoming less of a little sister to them and instead a beautiful young woman. On the day of your birthday the Allfather reveals to you why you were made to leave home and come live in Asgard. Odin wishes to form a long-lasting bond between Asgard and Midgard by having you marry one of his sons. Unfortunately, the decision won't be up to you, but the Allfather himself.
After Loki supposedly gave up his life to save Thor from Thanos, the God of Mischief transported himself somewhere where he could escape Thanos's wrath. Ending up back on Earth, Loki realizes he is still mortally wounded from his bought with Thanos, and he is not healing like he should.
Wounded, alone, and afraid of being found, Loki disguises himself as a common Midguard creature to keep himself hidden. He is found by a young woman who - unknowingly - takes in the trickster God and nurses him back to health. Loki finds himself torn between messing with this mortal to get what he wants, or to return to Thor and help his brother.
The mortal in question, though, has no idea who she has saved, and what crazy, messed up world she has been hurled into.