Usayama Joshi Koukou 2-nen 1-kumi!! - Vol. 1 Ch. 5 - Hanaoka-sensei

[MangaDex]

 

[Marek79813]

Will he ever get to the bottom of this?

 

[ARealCoolGuy]

Haha, it's essentially sexual harassment.
Imagine if the genders were reversed, and a female teacher were finding drawings of her - with one of being of her with her cleavage show, and her say 'be mine' - it'd be totally creepy.