My wife made me promise update

My wife Elaine had me promise to help her sister get pregnant and I did as requested. Having a daughter last year in February. We have been living together as a man and two wives. Elaine can't get pregnant again due a problem with the birth of our child, child was fine, but Elaine can't have any more children. But we still fuck regularly, Kerry is also a regular sex partner and like Elaine before her doesn't take precautions and is again pregnant. I'm doing very well in my career and the only real change in my life since Kerry joined Elaine and me in our bed, was buying and moving to a bigger house and on acreage as well. We have the support of our parents and as we're all happy with our arrangements, they have come to accept it. All our children are still a little young to understand our marriage arrangements at the moment and are also have a happy life with 2 mothers.