Sibling Rivalry Turns Lustful with Voluptuous Professor’s Tutoring

Takashi has always lived in the shadow of his older brother, Satoshi, who is more accomplished in every way. Despite this, Takashi harbored no resentment until Satoshi married Miwa, the woman Takashi loved. Now, seeing Miwa with Satoshi daily and hearing their intimacy through the walls, Takashi’s jealousy festers. However, his college professor, noticing Takashi’s untapped sexual potential, offers to transform him. With her guidance, Takashi aims to surpass his brother in a realm where he holds the upper hand.