Saki Tsukioka (40) has recently been busy with frequent business trips, so she's been helping her son with his studies in her husband's absence. However, tutoring a teenager turns out to be unexpectedly challenging, and during their sessions, physical contact between them gradually increases. Each time, she notices her son's body reacting visibly, making it difficult to focus on academics. Drawn to his responses and deeply moved by the way he clearly enjoys her touch, she finds herself emotionally healed in ways she never expected.