Define of Crossover Characters: A crossover is the placement of two or more otherwise discrete characters, settings, or universes into the context of a single story.
I have seen Pictures and Stories where Balto and Jenna are Romance Attracted/Having Sex with Characters outside Balto Movies. Straight, Bisexual, Gay, Lesbian.
For Balto, it's Nala from Lion King, Simba from The Lion King, Scooby from Scooby Doo, Humphrey/Kate from Alpha and Omega. Bolt from Disney Movie Bolt, Charlie Barkin from All dogs go to heaven, Spirit from Spirit: Stallion of the Cimarron, Sasha-La-Fleur from All dogs to heaven 2, Vixen/Tod from fox and the hound, kaa from the jungle book, Dodger from Oliver and Company, etc. 
For Jenna, It's Nala from The Lion King, Dixie from Fox and the Hound 2, Spirit from Stallion of the Cimarron, etc.
I never knew Balto and Jenna were so willing to Cheat and to be Romance Attracted/doing sex with others than themselves.  If you want my honest opinion I have never like this type of Crossover Content for Balto and Jenna. I don't classified that content hot and sexy. I'm just making this face:  
So wonderful seeing two characters that I think are definition of forever love. I would rather see Friendship with Crossover Characters not Cheating, Romance Attracted, Sex. Thank you very much but Balto Fandom does not like that.