Why [ Yandere bakugou x reader ]

If one word can describe how young ( Y/n ) felt, it was , why , why was she like this. Why did this have to happen to her, Why was she born. At the young age of five her parents abandoned her and her six brothers to fend for themselves. So she took the role of parenting and raised her brothers on her own, then as she got older a mark appered on her eye and also on her brothers. Was that the reason why her parents left them?. She doesn't know and mabey never will

Years past, and ( Y/n ) and her brothers were finally 16 years old, making her the oldest of them. Her youngest brother begged her as a birthday wish if him and the rest of his brothers could attened UA. And like any other good sister on a birthday she agreed. But on one condition,she would have to attend with them. While during the exam ( Y/n ) saved an ash blonde boy from getting crushed, but caused him to get mad. The more ranting he did gave her less reasons to give a fuck about him. She didn't care at this point so she left him and continued the exam. And as always she was accepted into UA along with her brothers

On the first day of UA she was greeted by none other than the blonde ash boy from the entrance exams. It was enemy at first sight, those two did not get along for anything, ( Y/n ) could stand him but if he dare lay a finger on her brothers that man was dead meat. But when the time came for hand to hand combat he lost and worse .... it was to her. His rage filled him and he attacked her after school causing her to punch him in the face hard enough to bring him to the floor. And that moment his hate went away, no body had the guts to punch him or let alone speak up to him making her the first. The boys hate for her turned into a crush and that crush turned into love.

But what happens when love turns into obsession, and that obsession drives to murder.

Why ?!