1boy 1girl bare_shoulders blonde_hair blue_eyes blush breasts censored collarbone completely_nude condom cowgirl_position cum dan_(orange_train) drooling girl_on_top gradient_background happy_sex heart heart-shaped_pupils hetero highres holding_hands idolmaster idolmaster_cinderella_girls interlocked_fingers large_breasts linea_alba long_hair looking_at_viewer motion_lines nail_polish navel nipples nude ohtsuki_yui open_mouth penis pov pussy red_nails sex sidelocks smile solo_focus straddling sweatdrop symbol-shaped_pupils teeth thighs trembling tsurime upper_teeth_only used_condom vaginal wavy_hair