Rule 34 Dev - 1girl arm_behind_back arm_mounted_weapon armor belt big_sister bioshock bioshock_(series) bioshock_2 breasts curvy diving_helmet diving_suit dry_suit facing_viewer gloves greyscale helmet medium_breasts monochrome needle oxygen_tank pauldrons shion_humine shoulder_armor solo standard_diving_dress waving weapon white_background|21076712046