The Zoologists/Mounts Lisa
Seeing a great opportunity to mount a bitch Max hops onto Lisa's back and quickly starts humping. His doggy dick finds its mark, Lisa's abused pussy. It slips right in, a moan escapes Lisa.
Hearing the moan Page runs into Lisa's room to find Max on top of Lisa. He was smashing into her.
Lisa just stays there, the pleasure is all she wanted. Another orgasm hits her.
"Max, get off her"
She goes over and grabs his collar. A low growl comes from Max as Page tries to move him.
Lisa Orgasm's again as she feels Max's dick go further than her dads dick had. Then something else smashes at her entrance, and eventually pops into her. The dog had knotted her, his thrusts had slowed.
Lisa's pussy clamps done again as yet another orgasm goes through her, and she drops. The dog yelps, and David walks in wondering what the commotion is about to see Page holding Lisa up under the dog.
"Wow, Page. I didn't know you could do this to your sister"
Page now notices that it looks like she held Lisa up so the dog could fuck her.
"No dad, it isn't. Please don't tell anyone"
She thinks for a moment
"If you don't tell anyone of this I won't tell anyone about the condition she was in when you brought her home or question the cum filled pussy and panties".
"Fair point"
He was in the clear for now.
"Please help me" Page was struggling to keep Lisa up so the dog could untie when his dick deflates.
Lisa was unconscious and wasn't aware of what was happening. The last thing she remembered was the pleasure being to much for her.
...
Lisa woke sometime later. Max was curled up on the end of her bed next to her feet. She could hear moans. She was wobbly on her feet but decided to see who was having fun.
She walks to Pages room, sees her dad and Page making out. Dad was thrusting into her.
Lisa: