She just watches

As you play with her brother, Emily just keeps rubbing herself and makes no attempt to get closer.

You grin and wink at her and then renew your concentration on Peter's massive cock.

You look him in the face - his eyes are closed and concentrating on what you are doing. Then, his eyes shoot open in horror. You know what look is and duck your head down on to the tip of his cock in time get his load in your mouth.