After his wife became pregnant and returned to her parents' home, Takuya began enjoying living alone again for the first time in a while, yet gradually started feeling lonely. Just then, his sister-in-law Ayaka suddenly showed up, saying she came to help with housework. She treated him as calmly and gently as always, but he sensed something hidden beneath her demeanor. Soon, she pressed herself against Takuya's back, her large areolas brushing against him, triggering a gradual physical response. Sensing the soft, warm touch, his lower body grew increasingly sensitive. Confused and overwhelmed, he began to realize her true intentions. Could it be that she came here with this very purpose in mind? By the time he noticed, there was no turning back.