Dirty Doctor by Amanda Richardson

She was forbidden, and I couldn’t help but give in…
Langley Williams is and always has been off-limits.
Growing up, we were competitive enemies.
Any chance for a friendship dissipated the instant she laid her eyes on me—she’d made up her mind, and I was never going to be able to change it.
Even back then, I knew she’d hate me forever.
So, when fate decides to drop her under my care as a doctor, I hold out for as long as I can.
Staying away from her suddenly feels impossible, especially when I see just how fragile she’s become.
The problem is, I can’t give in.
It’s immoral—it’s forbidden.
Because Langley Williams is my stepsister.