His Mistress, The new Phantomhive (Sebastian x reader)

(The events of Kuro || never happened.) As Sebastian and Ciel walk into town, a fire from a small town house can be seen. They try to help but they only result in finding you, a young child. Ciels asthma becomes deadly from the smoke he inhales while trying to help. They bring you back to the masion where Ciel makes h...