parasitically

adverb
1
by living on another animal or plant and getting food from it
به‌شکل انگل‌وار, انگل‌طور, انگل‌آسا, به‌طور انگلی, انگلی‌وار, به‌شکل انگل, به‌شیوه انگلی
2
in a way that always relies on or benefits from other people and that gives nothing back
به‌طور انگل‌گونه, به‌طور انگلی
They lived parasitically at his home during his absence.