There's nothing concrete to this story yet, if ever. The base idea is of a yandere who isn't stupid enough to go on a murder spree, make the senpai hate them, or torture them. It would be about a yandere who is manipulative, and gradually makes the senpai entirely dependent on then after something like 10 2000 word long chapters. Or something like that. They would be manipulative and cunning, instead of stupidly hotheaded.