Mother Arisa, with her big tits, goes braless and always exudes a relaxed charm. She's carefree, handling both work and housework effortlessly, making her seem like someone you could completely rely on. But one day, she realizes her breasts are distracting her son from studying. Noticing that her inexperienced son is fixated on her chest, losing focus, Arisa becomes aware that she's the cause. Gently guiding his hand to her breast, she initiates his first sexual experience. This first step begins to transform the relationship between mother and son into something entirely new.