Your sister has to pee soOo bad but, you stop her and tell her she has to masturbate in front of you until you cum before she can. She's very unhappy and goes off on you but, submits in desperation. Make it quick! As she tries to hurry things along, fingering her cunt, the dog comes in and starts sniffing and licking at her. She screeches at you for not closing the door. You just mock her and tell her now she has to fuck the dog in order to release. In disbelief, she goes along with it. Whining the whole time about how badly she needs to go to the bathroom. She doesn't want t be knotted in fear of her bladder exploding... but it happens anyways. You see her asshole bulging from being filled full while she's mounted in doggy style position. The knot growing inside her until the canine pumps her full and she bursts in urgency. The cum pouring from her snatch and her piss running down with her ass to you to view. You leave her to clean everything up and her livid with you! Tags: role play/roleplay/roleplaying/role playing, dirty talk/dirty talking, taboo, knotty/knotted/knot/knotting/dog knot, yellow hair, ass/ass fetish, sister, pee/piss/urine, alternative/inked/tattooed/pierced, Cattie Candescent/Cat Candescent