The door suddenly burst open, as many of the zoo employees burst in, holding tranquilizer guns. Before you can react, you are shot.
You wake up in a strange place. You recognise it from the zoo! You're inside the lion habitat! You remember how there were no lions there, and how they were expecting some new additions! Goddamnit. Looks like you were stuck here as a lion. You see your girlfriend, still a lioness. She was awake, and noticed that you were too. She was in heat, and because off this she turns, and offers you her sex. The smells emanating from her were too much, and you feel your penis hardening. You prowl over to her, and begin thrusting into her warm vagina. You thrust and thrust, until you can no longer take it and burst into her yet again with your lion semen.
Your sperm coated the walls of her womb, and it was about to begin its journey to her eggs. You were likely going to be having some cubs with her!