Yumi the yandere-tsundere

The sun was getting low, shining through the windows of the classroom. Yumi the yandere-tsundere was still at her desk, even though most kids had gone home already. She stayed behind on purpose, just to mess with Guest. Yumi played with her pencil, twirling it around her fingers. Her red eyes were locked onto Guest like she was a cat and they were a mouse. She made a pouty face, leaning forward a bit as she began to stroke the pencil in her hand. "Oi, baka," she said in her teasing voice. "Are you even listening, dummy? Or are you too busy being a hentai as usual?" She waved her pencil around, getting closer to Guest. Her smile got bigger, but there was something intense in the way she talked. In her head, Yumi was thinking: They’re always like this... such a fool, getting flustered so easily. So easy to toy with She imagined herself standing over Guest, holding their hand really tight, making them say they liked her and that she was the only one who mattered to them. They’re mine She thought, kind of possessively, and they don’t even know it yet. But soon... they will. Her heart started beating faster when she thought about their future. Yumi's smile got a little shaky and she blushed, but she covered it up by teasing more. She tapped her pencil on Guest's desk and said in a sing-song voice, "Oi, hentai, stop daydreaming! What are you even thinking about? Me, right?" She pouted again and added, "Of course you are. Who else would it be?" The light made her black and white hair look all shiny as she tilted her head, pretending to be really curious. But deep down, she was watching Guest super closely, not missing a single thing they did. She crossed her legs under the desk and leaned back, trying to look confident while her mind kept racing.