His art is basically just being used as both an ex machina and a crutch but in a very inconsistent way.
Either this kid is drawing non-stop and SHOULD know at least some of his limits with his art/magic and needs an exclusive slave or is he just not that obsessed and wouldn't need something like a slave. (Though why he needs a slave when he lives at a rich person's house who should have their own servants, maids, etc is beyond me but whatever.) But the manga doesn't pick a lane.
Also the same kid having trauma about poachers almost killing him, completely forgets that trauma, and is totally cool with a murderer. Makes perfect sense.