I've thought of a few. Would want them all to be microwave safe so they can be heated to accurate temperature. That makes a big difference in animals and humans....
1) a penis worn by females. First it would fit inside her vagina and have an external penis section. Then, the internal piece would be inflatable so she doesn't have to wear it like a strap-on. Also, a small tube that could fit in her urethra, allowing her to urinate. Finally, a pump that controls stiffness. As you could imagine, it would be something that could be worn/used all day long.
2) A female pig vagina, soft, fluffy, pink, and stretchable. Add a pump to allow adjusting how tight she is and another to add lube so she would "get wet" during use.
3) A male canine penis like we've seen but with another pump to allow adjusting stiffness/firmness. It would normally be flaccid but get firm with one pump, control the knot with a second and squirt with the third.
4) A female Bonobo chimp in full bloom. That would be a two handed toy!