Rule 34 Dev - 1boy 1girl abs alternate_muscle_size arm_support biceps bikini bracelet cheekie choker collarbone ear_piercing fingernails greyscale heart highres jewelry kitagawa_marin lips long_hair monochrome muscular muscular_female necklace parted_lips piercing sharp_fingernails sono_bisque_doll_wa_koi_wo_suru swimsuit twitter_username|23734650888