I had a cat in my neighborhood growing up named Mittens (because he had thumbs) that did this same exact thing, it was only a year later after he started getting quite chubby that we realized not just one person was feeding him occasionally, but the entire neighborhood was fooled into feeding him every day!
The two morals of the story: 1. Cats are obligate carnivores. 2. Don't let your cat outside, worst case scenario they get into danger or hurt, best case scenario your outdoor cat becomes someone else's indoor cat. I love this, this was adorable