Recently, Yuna's husband's erectile dysfunction has been increasing, and she is becoming more and more frustrated. As she spends sleepless nights in agony, she finds out that her daughter's husband Ryuichi, who lives with her, is not being paid attention to by her daughter and is instead masturbating every night... Yuna is surprised by his extra-thick, huge cock, and cannot resist the lust that wells up from deep within her body, so she takes care of his cock all day and night under the pretext of "I'll take care of him." The son-in-law is venting his overflowing sexual desires on his mother-in-law, who is addicted to the pleasure of his huge cock and indulges in her carnal desires, but...