I say if this is the first time he's used your S's to get something, and it really is something small...then just let is slide. If he keeps it up, then have a conversation to remind him of the agreement.
I can see how you'd want to use this as an excuse to reach out to him. Although I don't think it would end up on a positive note, do you? If you want to reach out to him for something, maybe it should be for something more positive...not something that will leave him acting defensively.
