2girls, asphyxiation, bare_shoulders, bathtub, bikini, black_bikini, breast_rest, breasts, brown_hair, cleavage, closed_eyes, covered_nipples, g-string, gentle_persuasion_(meme), girls'_frontline, grey_hair, hair_between_eyes, hair_rings, holding_another's_head, huge_breasts, kion-kun, mdr_(girls'_frontline), meme, multiple_girls, o-ring, o-ring_bikini, official_alternate_costume, sidelocks, smile, splashing, springfield_(girls'_frontline), springfield_(stirring_mermaid)_(girls'_frontline), string_bikini, swimsuit, thong, thong_bikini, tile_wall, tiles, torture, water, waterboarding