She definitely used to be a man. By Rhodry

These two humanoids aliens. Decided to visit a primitive world, a world called Earth. Unfortunately you need permission to visit primitive worlds like this, that in a short time will be level one and soon level two in a several " untranslatable".

These beings look exactly like us. We could borrow and play with them for " untranslatable " time.
In a classical alien abduction. These two decided too borrow there bodies mature mother and sister. The two aliens were surprised of such low level being like these, could develop near one level culture. There minds were barely 6 or 7 percent used.
They could fully transferred and have room to boot. So they but there original body in stasis.
As they left there craft in there hoist bodies.
These are native female that aren't to un to similar to our peoples females.
AS they slowly undressed there hoist bodies. Another native appear in the structure.
As the Mother hoist and daughter hoist noticed a teenage boy. Shocked and surprised what his mother and sister were doing.
Before he could do anything. Mother had strange looking flashlight device. That flash. All the sudden he black out.
As he woke up. His mother and sister were smiling at him. He could swear, he's mother and sister were stark naked. And that strange feel that these two weren't there mother and sister. But they were at the time. And other thing is like he had sex with them. But that was impossible. But he had that feeling. It was like there as a hole in his mind.