I think it was a oneshot. Same author for both of these

1 - there's a guy who is the school monitor and has a stick. He bullies a girl daily. There's smut or ecchi? Some scenarios are pointing out her pink bra through her white shirt, him giving her oral on a balcony, running into her at lunch and spilling food all him on purpose and then making her lick it off him. The girl's best guyfriend likes her as well.

2 - the girl is dating her teacher secretly, who wears glasses and pretends to be a clumsy nerd. He's really a model and purposely flirts with other girls because he enjoys seeing her cry.