This is my Sans AU. It is supposed to take place after the genocide run. Just before Sans could turn to dust, he inserted in his soul a strange fluid only known as "the prototype" or "the experiment". Later in this series, it will be revealed what it is. Then, he regenerated with two hearts. One that is his own soul and the other being a human-shaped pink heart shielding his soul. His attire also changed and his eye socket has two blue circles for pupils.
This AU was created by me. If you use him, please credit me.