In a small town bound by tradition, Selene lives a life overshadowed by her older sister, Adeline. At eighteen, girls are promised a life in the big city with a husband chosen by their father, a tradition Adeline is now at the center of. As the adored daughter, Adeline is set to marry Julian, a wealthy and striking man whose appearance and charm leave everyone captivated.
But as Julian steps into their lives, something unexpected happens-his gaze lingers not only on Adeline but on Selene, the overlooked younger sister. What begins as uncomfortable glances soon grows into something far more dangerous: Selene finds herself falling for her sister's perfect boyfriend.
Caught between the roles of dutiful daughter and forbidden desire, Selene must navigate the jealousy, secrecy, and guilt that comes with loving someone she shouldn't. With her father's strict rules and Adeline's charm, Selene feels trapped in a life where she is meant to be invisible. But as her heart begins to betray her, Selene faces an impossible choice: stay in the shadows, or risk everything for a love that could destroy her family.
My Sister's Boyfriend is a gripping tale of forbidden love, sisterhood, and the painful struggle for identity in a world that demands conformity. Will Selene sacrifice her own desires to maintain the family's image, or will she step out from behind her sister's shadow and claim the one thing she was never meant to have?