2girls, beach, bikini, birthday, blonde_hair, blue_bikini, blue_sky, breasts, collarbone, cup, disposable_cup, drink, drinking_straw, drinking_straw_in_mouth, glasses, green_eyes, hand_on_ground, happy_birthday, holding, holding_drink, horizon, imu_(senran_kagura), jeaike_art, large_breasts, looking_at_viewer, miyabi_(senran_kagura), multiple_girls, navel, outdoors, parted_bangs, sand, senran_kagura, senran_kagura_estival_versus, senran_kagura_shinovi_versus, shiny_skin, short_hair, sitting, sky, smile, stomach, striped, striped_bikini, sweat, swimsuit, water, wet, white_hair, yellow_eyes