You hold her tight, still shaking

The 'milk' is working and you are still incredibly excited, even after your orgasm. Sis is scared, and tries to push you away, seeing daddy out the corner of her eye. But you hold her tight as Daddy comes over and fondles her small naked breasts. Sis whimpers, but you're so turned on, by- by something...

You undo Daddy's pants and slip out his cock and push her to kiss it, pushing it until it slips into her mouth.

Daddy sighs and says Thanks little slut, and pulls sister's hair. You stand and watch, rubbing your pussy, watching Daddy take the young mouth... wanting your turn.