He’s confused

Jake's eyes raked over Ari's naked form, still hazy with sleep and alcohol. He took in her tousled hair, as she sat ontop of him, both completely naked. Misinterpreting the situation entirely, he grinned wolfishly.

“Well well, looks like you're done with Tyler already” he rumbled, voice low and suggestive. His hips bucked forward, the thick line of his morning wood slapping against her stomach. “Good, 'cause I've got plenty more dick for you to play with”

Large hands palmed her ass, squeezing the firm globes roughly as he ground against her. Jake leaned in, hot breath ghosting over the shell of her ear. Ari can tell that he’s confusing her for the girl getting fucked by Tyler, but her hornyness and the alcohol took over her body completely, rendering her unable to move or speak, just waiting to see what happens next.