After administering drugs putting it in a state where it thinks every flesh hole in sight is a female reproductive organ, we released the Lizard Runner.
It rushed towards the test subject at breakneck speed in order to insert its penis into her vagina.
After insertion, the tip forks and firmly spreads open inside to prevent it from slipping out of the vagina.
The test subject slept for two days after mating because of pleasure and exhaustion.
The monster's penis is inside my vaginaaaa... It's in my wom.... my womb... Aaaahnn... It's cumming... inshide.