>>533982293
It's explained that Raiga "pays him a lot" (probably meaning more than it's really worth) for fixing his motorcycle. He also pays Shirou's taxes.
>He also refuses to live out of Kerry's inheritance
Raiga controls that money.
>was working to pay for his daily bills
I doubt a teen alone could make enough money to pay for that gigantic mansion. Also, pretty sure he just does people unnecessary favors, instead. And yes, that means, he did it for free. He was already on his way to becoming a janny.