Vishnu, the preserver of your universe, devised a approach to make sure that the Devas emerged victorious inside their quest. In Devi bhagavatham its Plainly outlined that "Sthri rupam of Lord vishnu is Parvathi/ durga". It is also mentioned that lord shiva only has attraction to his shakthi Parvathi https://www.youtube.com/watch?v=R8yE5JVNaHw