Have a dog fuck Lily.
From Create Your Own Story
The zookeeper returns and you ask him to have Caine fuck Lily. The zookeeper tells you that he has a better dog for the task and returns with a giant rotweiler.
At first Lily is on her hands and knees on the bales of hay, but then she rolls onto her back, letting her ass hang over the end of the bales so the dog can really pump into her. The dog's knot slips inside her. The dog cums, but his knot is still inside her. The dog licks her face and Lily pets him behind the ears as you all wait patiently for the dog's knot to go down before he can slip out.
Go to the Zoo. (see what other animals are available)
