Y/N is working for the Mad Titan Thanos ever since she was kidnapped by his servants. Trained since she was 7 to become his weapon. At the age of 12 Y/N got powered by 3 of the 6 Infinity stones and ever since she had been training in Hope's to control them. If here wasn't for Loki she wouldn't have made it. Y/N and Loki got closer ever since that day. Loki considers Y/N as a baby sister and Y/N sees Loki and the best older brother. One day Thanos invites Loki to his Sanctuary and gives him The Septer so they he could bring Tesseract to him. But Y/N doesn't want Loki to go alone so she insists to go with Loki and when Thanos allows Y/N to go with him her life will change when she meets the Avengers. BTS x reader AU Note Loki is only a brother figure