This is a story about Izuku's sister.

WARNING: Yui is a not fragile and weak she is a bad ass You are Yui's little sister and you end up going with her to the Sakamakis. However you are 5 years old. See how the Sakamakis along with the Mukamis will be able to last with the little girl. How long can the keep their masks on and not give into Y/N's cuteness.

Before Sebastian Willis knew it, his hope for a promising future has died right before his eyes. His perfect match, his soulmate, his Other, has died right before him. Without her, there's no chance for him to have a decent life. There's no chance for him to have a happy life. How will he ever find a way to continue on? Will there ever be a chance that he could possibly move on? Of course not. How ridiculous. She was his perfect match; one of a kind. No one could replace her. --------------- !!WARNINGS!! The content may include the following that may be sensitive for some readers, if you feel you may be sensitive to the following topics, your viewership is nor advised. !!BL (Boys Love) !!Hints of Depression/Suicide !!Hints of Anxiety !!Emotional and Sexual Manipulation !!Sexual themes/hints !!Dealing with immense loss If you still want to continue reading, I will put warnings beforehand if needed.