He follows Thor like a shadow through the palace, being wherever he is, doing whatever he does; because this is Loki —cunning, mischievous, mad Loki— who feeds on other people’s discomfort like a fly feeds on rotting flesh. It is in his nature to provoke, so when Thor retreats to the bathing rooms, grimy and sweaty, his blood still singing with war, Loki cannot help but follow, silent in Thor’s footsteps. x
"Know thou first, I love the maid I married; never man sighed truer breath; but that I see thee here, thou noble thing, more dances my rapt heart than when I first my wedded mistress saw bestride my threshold." Coriolanus, Act IV, Scene 5.
"Loki, in his heart, wants to be worthy. And the way he achieves that worthiness, the way he achieves his redemption, his salvation, is to ultimately sacrifice himself for Thor and for Jane. It’s a very cathartic, and moving moment; by saving his brother’s life and avenging his mother’s death."