It just came to mind...
Dragons are reproduced by telegony.
Here the dragon stole the princess and had sex with her (well, he has a small penis, well, the size is not important). The princess can't fly away from it (well, there are different types there, hue-may), and then the dragon loses the prince (sometimes with a fatal outcome). A prince marries a princess and she gives birth to a dragon (the dragon was the first).
P.S There is a belief that only a virgin can calm a dragon.
P.P.S. I need to ask my mom if she really made me tea today.