Rosita feels Jacob trying to press back and, playfully, she braces him from doing so. She can't see what Astarion is doing but she can guess.

"Oh, Jacob," she sighs, fondly admonishing. Her eyes flick up and meet Astarion's around the buffer of him. "He's proven he's anything but already." She, on the other hand, breathes hit and heavy and close over the sensitive skin of his dick without actually more than brushing him with her lips.