Rule 34 Dev - 1girl ahoge arm_behind_back bikini birthday breasts character_name christmas cleavage commentary dated earrings frilled_bikini frills gift girls_und_panzer girls_und_panzer_senshadou_daisakusen! gloves greyscale hat hat_bell holding holding_gift isuzu_hana jewelry long_hair looking_at_viewer lowres medium_breasts monochrome nanashiro_gorou navel official_alternate_costume open_mouth santa_bikini santa_gloves santa_hat smile snowman_print solo swimsuit upper_body|15048818577