[Annomike] Mizu Asobi | Water Play (Comic Kaien VOL.27)

An older brother, Onii‑san, is caught off guard when his younger sister, a schoolgirl in a swimsuit, asks for help putting sunscreen on her sweaty back, igniting a forbidden temptation. The scorching summer heat drives her to strip down to a revealing bikini, teasing him with seductive glances and a provocative pose that hints at a deeper, intimate encounter. As the brother fights the irresistible pull of his innocent yet daring sibling, the story builds toward an inevitable, erotic climax.