Little Sister (Reader x Haikyuu)

Plan

???'s POV
"Yama, anything yet?" It's been a week since we teamed up. If she doesn't have anything good, she's out.

"Why, yes I do! Turns out, (F/N) was bullied in middle school. Her parents had died and their parents were friends with her parents. Her friends' parents had told them to be nice to her since she was going through 'troubling times'. What she was going through, I don't know. A lot of them faked being friends with her and as soon as her parents died they thought they were off the hook. They teamed up and started bullying her. Knowing all her secrets, it was easy to bully her. I don't know the secrets they knew but I know one of her 'old friends'. Turns out, it's my sister. Obviously she never told anyone about her bullying past but now that I know I can blackmail her to my parents~"

"Good work, Yama-chan~!" I sang and smiled. "Go do that and from there we can continue on our plan~"

Yamato's POV

I skip and hum as I walk home. "That silly girl thinks I'm trying to help her~ But I have dirt on her too, just in case this thing goes south~!" I finally got home and thank goodness my parents weren't home. "Oh, Siyaka~"

"Hihi Shishiri! How was school?"

"Gooood~ But I wanna ask about (F/N)."

"Sugawara (F/N)? The girl I was friends with in middle school?"

"Yep~ What dirt did you know on her? I wanna know her secrets~"

"Well, you see, that's confidential."

"Wanna know what else is confidential? The fact you bullied her when her parents died."

"YOU BITCH! HOW DO YOU KNOW?!"

"I have my sources~ anyways, tell me dirt about her~"

My sister sighed. "Ok, well after her parents died the four of us figured she couldn't go running to her parents about how mean we were so our parents nor anyone in our families knew about it. Her uncle was taking care of her and her brother at the time but their uncle would abuse her brother. She said one day she stood up to him and started abusing her too. Her brother had a best friend that always worried about them. One day he came over to find both of them on the ground covered with bruises. The uncle got upset and yelled at him to leave but he wouldn't so he got hit. The uncle didn't abuse him much since the uncle wasn't actually responsible for him. The kid went home and told his parents but without any proof other than bruises, they couldn't do anything. Being the kids we were we made fun of her for everything. Honestly I feel bad now. We just did it cause we didn't believe all those things actually happened, seeing as we had never seen any bruises. She said she had to cover them up with make up, but no one ever saw them. Well, except for one person. His name was Wakatoshi Ushijima. He never made fun of her but he wouldn't help. He was the one out of the four of us who told us to stop but wouldn't take action. Every time we would say something bad to her or about her he did nothing. Just stood there with his blank stare as usual. Anyways that's all I know. Hope that helped with what ever crazy shit you're doing, knowing you. Just, don't tell our parents."

"I won't. But if I need to, I'll blackmail you again~ thanks sissy~" I ran off before she could kill me. I was off to tell Yukkishima about this new info.