This is an extremely taboo novella available only on Payhip.

Blurb:
I wasn't supposed to crave him, but I do.
The more I try to resist, the more my desire grows.
One night changes everything because now he wants me too.
What we're doing is sick, twisted, and wrong,
but like addicts, we chase the high,
but how long until we fall?

TW: incest between blood relatives