The favor you offered once should not quietly become somebody else’s permanent plan.

Help given once can turn into an arrangement without anyone agreeing to it. The other person builds around what keeps happening, you keep doing it because stopping now would look like a change of heart, and a kindness slowly becomes an obligation with no start date. Resentment usually grows in that gap rather than in the original favor.

If something you offered has settled into a routine, say so plainly and early, while you can still say it warmly. Name what you are glad to keep doing and what needs to end or rotate. Most people adjust easily when told; almost nobody adjusts to a hint.