You've noticed how close your teachers are getting to you. Aizawa, Yamada, and Toshinori have been very affectionate lately. They'd come up and hold you by the waist and pull you closer to them. They'd even sometimes go as far as pecking your lips. What you didn't know, was that they're yanderes. And they all want you. So they agreed to share you. And they won't let anyone or anything stop them from having what belongs to them.