2girls black_hair blurry blush brown_eyes brown_hair brown_shirt brown_skirt clenched_teeth commentary depth_of_field desk eye_contact glasses highres indoors long_hair looking_at_another multiple_girls neckerchief original red_neckerchief school_desk school_uniform serafuku shirt short_hair short_sleeves skirt straddling strangling sweat teeth tenchi666 yandere yuri