It's a Meliodas x reader fanfic and you'll have to read it to find out You might not know what its from but the anime is called the 7 deadly sins so check it out its on netflix and probably youtube

Kimi is a prodigy in the world of art. She was born with the gift to paint, but with this talent, she had to sacrifice something: Her voice. For as long as she can remember, she has always been a mute and because of this many people have stayed clear of her, unable to accept the fact that she cannot reply verbally to them. So, she has kept to herself for most of her life, busying herself with painting. For her benefit, her parents get her into Ouran Academy on an Art scholarship. They believe that here she can blossom and perhaps make some friends while she is there. Kimi is at first indifferent about being at Ouran but after meeting the Host club, her whole world turns inside out; especially when the dark lord and the playful twin take an interest in her. Meet Kimi under the Sakura tree to join her adventure of love, belonging and hope.

I present to you, Lady Jayden Hamato of Locksley! Jayden is a young woman who has been pampered most of her life, but unlike most other rich people has also lived a life caring for the others around her. She was always in her manor's village, trying to help people out as much as she could, but after a large mafia group kidnaps her and hides her away, torturing her in numerous ways and eventually killing her mother in front of her eyes, she suddenly has an eye to kill. This happened at the age of ten. Now, Jayden is twenty and betrothed to an Irish Prince, who tries to see her as much as possible, but as both get older, they get busier with their duties. About three years earlier, Earl Ciel Phantomhive's manor had gone up in flames, his parents had been killed and he was kidnapped. Because Jayden couldn't prove her strong belief Ciel Phantomhive was not dead and instead kidnapped, she could only sit and wait for him to return, something she hated doing, so instead of doing that, she started her own investigation with her Irish Prince, who is merely along for the ride. Just as Jayden figures out who took Ciel, he is returned, accompanied by a raven haired butler who she soon figures out is a demon most likely contracted with Ciel for something. At this point, Jayden has nothing to do and joins in on investigations.