After Homelander killed Madelyn Stillwell, he was obsessed with still having her around. He started out just drinking her left over milk but when it ran out he turned to Doppelganger to fill his needs. Homelander came to him because he can transform his body into anybody he chooses and he threatened Doppelganger to change into Madelyn whenever he wanted so he could talk, relax or get it on whenever he felt like it. Then Homelander told Doppelganger he had to stay in a secure place away from people so he couldn't be off Vought's radar. After a few months of this he wanted Doppelganger to transform into Queen Maeve and then do the same with Starlight so he could talk with fake versions of them that didn't despise him.