The Animals Inside

You are walking along a dark alleyway when you are ambushed and knocked out. In another universe, a young Sans is attacked and you both wake up in a white space with an offer being given by an elegant woman: take over the young Sans's body and let him live a peaceful life elsewhere. What is your answer?

The story about my OC

All drawings used are my own, and I'm not the best at drawing human-like beings
If there are references to other stories, they are coincidental, since this story is purely about my OC.