mkon130 — My Depressed, Unemployed Former Honor-Student Stepsister Has No Self-Worth — Kasumi Tsukino

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When Fuku returns home for the holidays, his stepsister Kasumi—a former honor student and major-company employee—has remained shut in since overwork broke her down. Her family urges treatment, but Fuku worries that forcing herself to meet expectations caused the damage. When she apologizes for being useless and says she will do anything she can for him, he desperately searches for a reason to make her feel needed and asks to see her breasts. Kasumi insists her naked body has no value, but Fuku denies it and eagerly buries his face in her chest.