The Beginning

Turns out Tsukune had a girlfriend the whole time, Melioda! But what if the said girl is lot more recognized than he realized. Melioda actually betrayed the demon clan to force the goddesses to use the seal and destroy themselves and unsealed the the clan later and revealed the truth about the incident. As a result, the demons stayed out of human affairs with a few breeding with humans, creating Yokai. Also, demons don't age, so the commandments will still be around and friends with Melioda.