So I think I need some sort of slightly bigger dragon and some anthro character. Then here come Vitroy (right) and Xetum (left) and a silly background.
Vitroy was some bored dragon that rent himself as temporary vehicle to earn fish or treasure, until he noticed that Xetum always needed his ride. So somehow a long-term services was provided and they live together happily.
But one day they had divergence on an unhygienic snack.