The Sun, The Moon and The Star

Another Imagine Loki Prompt. You are Loki and Thor's sister, your presence means only the truth can be spoken, but if you are forced to do so against your will, you become ill. After the Avengers, Odin uses your powers to force Loki to be truthful, you become very ill, but the only thing that aids your healing is Loki. Thor convinces Odin to let you be in your brother's presence.