Heroine: Mature Elder Sister Is a Hidden Crazy Girl

[The female protagonist + the yandere + the female protagonist pua + the male protagonist resisted appropriately and was suppressed] What is it like to have a yandere mature older sister like you? She will pamper you very much, be very good at hiding herself, wishing she could dedicate everything to you, wishing she could tie you to her side and never leave her. But Zhang Yan resisted. She wanted to bind Ye Li's body and mind tightly to her, so she, who was familiar with psychology, kept pushing him. Let Ye Li be inseparable from him and let him report any of his actions willingly. When Ye Li discovered Zhang Yan's conspiracy, it was already too late. He couldn't leave her anymore. Even if he left her, he wouldn't be able to run away. She would still catch him back to him.