I got my sister in law pregnant

Me and my brother's wife have been f****** since one year. My brother doesn't satisfy all her dirty fantasies. With me she becomes the women she is. She craves everytime we f***. Moans till she cries with pleasure. We tried everything . Just everything. From rimjob, p****** , femdom, making her my slave. Just everything. But the last time we f*****, I ended c****** so much deep in her p****. We tried pills but she still got pregnant. We don't know what to do? Any advice?