Bribed by my 3 year old

Well, he turned the tables on me this evening. It was time for bed and he pointed up to the top of the fridge and counted out on his fingers 'one, two, three..daddies chocolates and I do poo on toilet', I said, 'ok' and he ran off triumphantly to the toilet. This morning he had already received a lollipop as my bribe to get him to go on the big people's place of bum worship, instead of into the nappy he kept holding out to me. Yet tonight, after earlier asking for a nappy, he rather cleverly manipulated me. Now I am left to wonder at what point do we retract the treats as an incentive to poo in the porcelain pot. What did we start?