Balthromaw is a promiscuous dragon and accused "Slut Dragon", Who has Soul-Bonded-
(Entered into a pact between a rider and himself that connects their souls in an orgasmic process akin to sex)
-with various partners including Rick, Morty Smith, and Summer Smith in the animated series Rick and Morty

First appearing in episode 4 of the 4th Season

• 'Rick and Morty' Season 4 Episode 4 – Claw and Hoarder: Special Ricktim’s Morty.

Where Morty "Gets a Dragon."