Competition to fuck our stepdaughters

We had always been like that, complete for complete, with no need for anything other than to prove we were better than each other. Our competitions had always been somewhat healthy, until they came along. A couple of angelic girls who became our personal demons, with their tender looks and their tempting bodies. So they became our temptation and the only way to prove that we were better than the other was to get laid, it was an infamous thing to do but we wanted our stepdaughters and would do anything to make them ours. No matter how obsessive the case.