Is It Wrong to Sleep with My Best Friend's Boyfriend...?

A quiet realization shatters the protagonist’s world when she discovers that her feelings for Tohru have crossed a dangerous line. He is not just any man; he is the boyfriend of her closest friend, making her growing attraction both forbidden and deeply guilt-ridden. Unable to suppress these unexpected emotions or navigate them alone, she finds herself confiding in Shuuji, one of Tohru's friends. Rather than discouraging her from pursuing a path that could destroy her most cherished friendship, Shuuji proposes an unconventional and provocative solution: he offers to personally coach her through intimate training, ostensibly to prepare her for a secret physical relationship with Tohru. What begins as a misguided attempt to manage her desires quickly spirals into overwhelming sensory experiences. Under Shuuji’s intense guidance, she is bombarded by waves of sexual pleasure that blur the lines between preparation and indulgence. However, this reckless arrangement carries a heavy cost. As she surrenders to the escalating physical encounters, the emotional foundation of her life begins to fracture. The trust she shares with her best friend deteriorates, and the complicated web of secrets threatens to unravel every meaningful connection she holds dear, leaving her to question whether the fleeting ecstasy was ever worth the devastating fallout.