Which one should be correct?After a tiring soccer practice, Jack rewarded himself by indulging or wallowing in a box of doughnuts. Thank you.
After a tiring soccer practice, Jack rewarded himself by indulging in a box of doughnuts (with sprinkles).
Since this refers to a positive reinforcement, use indulge.
If in a negative sense, use wallow:
Jack tripped and fell, and caused his team to lose the game. All he could do now is wallow in his misery.
If you say that someone is wallowing in an unpleasant situation, you are criticizing them for being deliberately unhappy.