During summer vacation, a young nephew plays in an inflatable pool in the garage at his cousin's older sister's house, eagerly awaiting her return. When she comes back, she says, "I'm all sweaty too, let's get in the pool together." He starts splashing water at her, playfully dousing her with a small watering can shaped like an elephant. As they play, he aims a water gun at her nipples, soaking her thin clothes until they turn sheer, making her nipples visibly react and twitch. Despite being drenched, her sensitive nipples grow erect from the stimulation, and she gradually begins responding in an increasingly erotic way. Her wet hair, skin, and body exude a sultry summer atmosphere, creating a highly sensual scene. The older sister teases him, saying, "Aim at my breasts," inviting him to shoot her again with the water gun, her body twitching with each blast. Then she retaliates with her own prank—gently playing with and licking his nipples. Her touch makes his cock increasingly sensitive and aroused. She explains, "When your penis gets hard like that, you put it inside a girl's pussy," then straddles him, guides his cock into her slit, and slowly begins moving back and forth, teaching him the pleasures of adult play. As he continues shooting her nipples with the water gun, she pleads, "Stop teasing me... I can't hold back anymore." In the inflatable pool, water play and sex blend into an unforgettable summer memory. Featuring the older sister's beautiful face, gorgeous nipples, and a deeply intimate deflowering scene filled with maternal warmth, this release packs five major erotic highlights, making it a title that etches the essence of summer into your heart.