Rule 34 Dev - armpits arms_up bikini black_bikini blue_eyes blush cleavage detached_collar female female_only frilled_bikini frills hands_behind_head hisui hisui_(tsukihime) maid_headdress medium_breasts neck_ribbon ocean partially_submerged pink_hair short_hair solo swimsuit tsukihime type-moon water|6513641192