Yui, who lives with her stepson after her husband's death. She continues to care for her son, who became a recluse after her father's death. However, that is just a facade. Yui and her son had been aware of each other as different sexes since before her husband's death. One day, the two go on a trip. At the inn, she is pressured by her son, and while saying no, her heart is filled with joy. She sucks on her son's cock and is caressed on her secret parts, and overflowing lust. We deliver a story of forbidden feelings exploding and mutually passionately desiring each other.
