Yui has been married for six years. Her husband's premature ejaculation has been around since the two have known each other, but so far it has not improved. So she had an affair with a young man at her part-time job. She accidentally found an enhancement pill online and gave it to her mistress. Immediately his cock became erect and swollen, so big that she couldn't imagine such a big thing in the world! No matter how many times she ejaculated, it didn't soften but always got an erection. The two are immersed in sex, blending into each other, making love non-stop, Yui's pussy is always filled with the seemingly endless streams of semen of the lover...