Rule 34 Dev - 1girl akiyama_yukari aqua_background armpits arms_behind_head bikini black_hair breasts brown_eyes cleavage girls_und_panzer green_bikini medium_breasts messy_hair o-ring o-ring_bikini o-ring_top ponzu_rui presenting_armpit short_hair sitting solo strapless strapless_bikini swimsuit|25497227574