What's a witty, sarcastic comeback for "How about doing me instead?"?

So someone posted some anonymous Q&A thing, the first time was this person asked “Do me?” and I answer “Do you? A favor? Sure why not?”.
This person read my reply and now he asked another Q “How about do me instead?” and I want to reply back with a witty remark/reply yet letting this person feels like he still want me :P