Feel free to add me on Facebook to use the co-op breeding! I try to swap mine out with different dragons, and you can also ask if I have any dragon in specific to put up. I have 2 parks on different Facebook accounts, so make sure to add both!
1st Park: Eden Stevens (https://www.facebook.com/profile.php?id=100011661819679)
2nd Park: Auroria Feeder (https://www.facebook.com/drew.feeder.7)
Thanks, and I'll be sure to try to use your co-op dragons to try to get some twins! Have fun!