"Can you picture it?
A man that thinks he’s a god,
Treats his girl like a dog,
Only says that he’s sorry when he’s caught,
Crying cause he can’t control the way she dresses, who she knows,
Can you picture it?
So delusional,
(Everybody knows he’s an asshole, so I would have no regrets,
And everybody knows I’m an angel, I’d never hurt a fly, except-)
If I saw my best friend’s ex, he’d probably end up dead,
I would kill my best friend’s ex, cause best friends don’t forget,
Guess I get a little obsessed, but baby, if you’re getting upset?
I bet you just haven’t met my-my-my my best friend’s ex,
(Hope he gets run over by that BMW,
To stop him right before he tries that shit with someone new,
And if you hear that and start to get a bit upset, you just haven’t met my-my-my my best friend’s ex)”
https://www.youtube.com/watch?v=LAhu_kdcoSg

Penelope would fight a fallen angel for Magnolia, don't test her
Magnolia is Penelope's best and only friend, she'd fist fight overlords for her

Slight hint of Will dropping a mind-controlled Penelope off to get off with Vital for a bit, and then he left them alone together, and Penelope is just like "I know you, you son of a bitch!" mind control straight broken because she hates Vital
Just a hint though, may be something else, just those teeth marks are meant to come from Will's vampire fangs

"My Best Friend's Ex"-Emlyn
Vital-BubbleQueen
Penelope-Me