1boy 1girl arm_support bdsm blindfold bra breasts cellphone chain chain_leash close-up clothes_pull collar dated desk femdom finger_to_mouth greyscale heart_o-ring hetero highres holding holding_phone implied_sex indoors jorori leash long_hair looking_at_viewer monochrome nipples o-ring o-ring_collar original partially_undressed phone phone_screen pleated_skirt school school_uniform screen serafuku shirt_pull short_hair shushing sitting skirt smartphone standing stomach straight_hair sweat sweater_vest underwear