Pastelão literally refers to a large pastry or pie, but in Brazilian Portuguese slang, it's used to describe something that is overly dramatic, exaggerated, or cheesy, often in a comedic or unsophisticated way.
In the song, the lyric "Seu vampiro de filmes pastelão" (Your vampire from slapstick/cheesy movies) uses pastelão to mock a lover, comparing them to a cliché, perhaps even ridiculous, character from a B-movie. It's an interesting and somewhat rare word choice that adds a touch of playful disdain and humor to the lyrics.
"Leão" (Lion) is a passionate and playful duet that paints a picture of a wild, complicated love affair between two people who see themselves as outsiders.
The song is a conversation between two lovers who embrace their untamed natures. He calls himself her "despenteado leão" (disheveled lion) and she is his "leoa gostosa" (hot lioness). They don't care if anyone judges them, describing their connection as that of a "vilão particular" (private villain). The lyrics are filled with intense imagery, comparing their love to a force that can both "assassina" (murder) and fascinate. It's a relationship built on mutual understanding of their shared wildness and a love so strong he can only admit it when he's on stage, under the spotlights.