Spaying and Neutering is the KINDEST thing a pet owner can do for their furbabies. You should be proud of yourself and Karamel for this. Personally, I have two male kitties who went through the neuter surgery. They are crazy, playful, fun loving and Thin. I didn't read how old Karamel is, but, in my limited experience, cats neutered while they're still relatively young won't have any problems or weight gain. If I were you, I'd cross that bridge when I came to it. Just enjoy your little fellow and get him that wife he wants so badly. Twice the joy!!!