What is something you only do in order to indulge your significant other?

Do you only do it for use as a bargaining chip so that they will do for you things they don’t typically enjoy? Or does their enthusiasm infect you and you actually enjoy it to some extent? Or maybe you learned to enjoy it over time.
Is there anything that you do with or for your significant other that you would never do by yourself or with friends? If so, what is it?
What is something you only do in order to indulge your significant other?
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