@Mellowyell292
Why the box of chocolates? Teenage boys have zero interest in boxes of chocolates.
Why not pay the kid actual money?
If it's a favour then don't pay him.
If it's a job then forget the box of chocolates and pay him appropriately for his time, his commitment, and the level of responsibility involved.
£30 is too little.
My DD does cat sitting for my upstairs neighbour and doesn't even have to leave the building. She cleans out the bowls, digs out the litter box, plays with the cat, gives fresh water and a little pouch of wet food, and new dry food. She also cleans up any fur balls, puke, accidents, etc. For this she gets $100 a week. She also does cat sitting for the cats of her friend's family. She walks to their house, lets herself in, checks the house looks undisturbed, cleans food bowls, gives fresh water, digs out litter boxes, plays with the cats, checks there have been no little accidents away from the litter box, checks for fur balls, cleans as needed, and locks up again, for $100 per week.