A person who offers help seemingly out of the kindness of their heart only to hold it over your head every chance they get.
Someone who threatens to take away things they’ve already given you in order to have control over you.
Stacie gave me her bike 2 months ago without me asking because she didn’t need it and I really needed a bike. She is now demanding I help her remodel her house or she will take it back although it’s already mine, she never struck me as an altruistic exploiter.