Rule 34 Dev - 1boy 1girl armband blue_eyes bra breasts coiled hairband idolmaster idolmaster_cinderella_girls kirisaki_byakko lamia large_breasts medium_hair monster_girl monsterification navel on_bed open_mouth p-head_producer pink_hairband pointy_ears producer_(idolmaster) restrained sakuma_mayu size_difference underwear|13537996641