She is obviously a big slut and cock lover if she like watching porn with her friend.
You need to try and fuck her on the side man.
I would.
Corner her going to the bathroom and get her on her knees and whip your hard cock out and put it straight in her mouth before she even has time to think.
I'm sure she'll suck your cock dry. She looks like a horny slut, so yeah, just go for it.
Her mouth was made to suck a huge cock.