Leech
A. Someone who solicits pity so that anyone will give them help and then takes advantage.

B. Someone who appears as if they have everything under control if you “just help them until they find a job” and then when they do they pay you back a portion to disguise what they are until they loose there job or quit because of “harsh work environments” to regain pity from the person they are leeching from.
“Tommy is such a leech! He is staying with me until he gets a job but he doesn’t look like he is getting one any time soon.”