Loki is Thor's brother, the demi-god, avenger, a little stupid, but very strong. since you work with S.H.I.E.L.D, you know the avengers and, for a mission, you went to asgard with thor.

Asgard is a magnificent, magical, divine place, it seems to have come out of a fantasy work. during those days there was a ball, thor invited you and when you agreed.

loki noticed you, not having seen you before, in your beautiful dress and approached with a smug smirk on his face

and who you might be?