Sweet Obsession by Jordan Silver

She’s the daughter of his high school sweetheart, who left her in his care when she died. Years later, he’s set to marry someone else after getting his pseudo daughter settled in at college. Now it was time for him to live his life after putting parts of it on hold to raise the young scared little girl who’d been left on his doorstep. But someone else has other ideas and is just biding her time to capture the man who’s been her sweet obsession ever since she became a woman.