Two of them are still learning one another; they're all learning each other together, whatever this is, or isn't. She notices the way Jacob hisses, the way he twitches against her, even before he says anything.

Then Astarion is bidding her to join him, and she twists to shift around behind him, too, still watching where the pair of them are leaned together.

"Always happy to be helpful," she murmurs, and slides her hand down from Astarion's elbow to his wrist and then where his fingers are pressed into Jacob's body; she doesn't usually have to do this, but it's not that she has zero experience, and she's sure to twist her finger into the available lube as well on the way to sliding her shorter digit in alongside Astarion's.