I see what you did there.
I like the idea of a romantic rival being another dragon; there is some fun game play right there!Sorry, I got a bit carried away there. I just got an image stuck in my head of his sister being this diva singing "I'm every woman" stuck in my head and rolled with it.
The cleric casts message to this PC: "realize you and dragon doing it. Lady dragon, his betrothed, is here. Ate Paladin's horse. Ate rogue. Am wrapped in her tail. Pls return dragon."