This is an Alien Custom Unity Asset (CUA), ready to Probe your girls! I have enabled collision only on the Penis so you position your model underneath with no issues. You can make a simple thrusting animation for your girl to make her have sex with it, (CUA is not animated). Also there are plenty of great doggy style mocaps free on the hub where you can use that animation in your own scene.
Modified and released under CC Attribution.
Modified and released under CC Attribution.
