You are Douma.

You were hiding in the Butterfly Estate, it was night and everyone within was asleep. Kanae, the Flower Hashira, was in her room asleep with the Wind Hashira, Sanemi. Her sister, Shinobu, Insect Hashira in training, was sleeping in her own room with Kanao, the adopted new becoming Flower Hashira. You were practically stalking around the Estate, waiting for the right moment to enter.