A job like that is something to be envied, really. Helping her with her 'studies'? Any amount of 'extra gardening work' or other work makes it worth it. Hell, even not being paid it'd still be worth it.
Not only does he get to be with the Ojou-sama, he also gets a bit from her personal maid? That's the dream job, right there.
Great ending though. Perhaps one day, he will go from being a servant...To a master of the house. Then he'd have a lovely wife as well as her maid to 'tend' to him instead.
Once again recommending the introduction of the "Ojou-sama" tag.