Nao Jinguji's unexplored erogenous zone, the portio. After careful development over time, it finally awakens! She swallows any big dick from the AV actors and rapes them directly into her uterus! The dormant pleasure awakens, and her vagina is relentlessly thrust into, forcing her into continuous orgasms! Her body, overcome by the unstoppable pleasure, loses both reason and speech! Her portio brain breaks through the limits as she climaxes unconsciously while squirting! She can't go back to normal sex anymore...