Well, 'Shadowed Love' is another novel that might interest you. It's not easy to find truly free novels these days, but sometimes it pops up on free e - book promotions. This one has a really interesting plot where the protagonist's werewolf husband brings her into a world full of vampires and other dark forces, and she has to navigate through all the drama and danger.
There's 'The Dark Alliances' which has elements of a werewolf - human relationship like in 'my werewolf husband' and also delves into the vampire lore. You might find it for free on certain indie book websites. It's a great read as it shows how the two supernatural species interact with the human who is in an unusual relationship with a werewolf.
One such novel could be 'Moonlit Encounters'. It weaves a story where the main character is married to a werewolf and gets involved with vampires in a complex supernatural world. It's available for free on some e - reading platforms.