Yes.
I'm writing book. There is one part in the story where if the boy saves this other boy he will stay good, but if he does not his heart will grow dark and evil. Should I make him go evil or keep him good?
Why not do both. The contrast between good and evil would be thrilling. Now you just have to decide in what order ...good first/ evil second ???
Could be a great story plot.
~ happy writing ~
Go "evil" ... But from his point, he is doing "good"
After all, few people who do bad actually think they are doing bad.