Yui has been married for six years. Her husband's premature ejaculation problem has been present since the two met but has not improved until now. So she had an affair with a young man at her part-time job. Accidentally she found an erectile dysfunction drug online and let her lover use it. Immediately his cock became hard and swollen, so big that she couldn't imagine there was such a big thing in the world! No matter how many times I ejaculate, it never softens but always stays erect. The two were immersed in sex, mixed together, making love non-stop, Yui's pussy was always filled with seemingly endless streams of her lover's semen...