Since her student days, Monami has been wearing bras smaller than her actual size to hide her large breasts. Ririka, a former classmate who knows this, lusts after Monami's ever-growing massive breasts and sneaks into her room while she comes for advice at night. Initially, Monami despised Ririka, but gradually came to accept her feelings. When fingered, her G-cup breasts tremble; when given cunnilingus, her I-cup breasts sway greatly. The two lose track of time as they seek each other's bodies…
