Larsa's someone who has been around the rich ballers and knows all the tricks to get a man hooked.
Most of these younger women were raised with ZERO domestic or seductive skills. They just know how to look pretty. A lot of them even have masculine mannerisms and will call a man 'bruh'.
It's not hard to figure out why Marcus got his mind blown when this woman knows how to put the game down on him by listening to his problems, giving him the impression she cares about him deeply and wants to take care of him, probably encourages him, and gives him what he wants with no resistance.
"Hey bruh when are you gonna hitcha girl with some dinner at Perry's Steakhouse"
vs
"Baby, you know I support you. You can have whatever you want"
It's not rocket science to figure out why she has Marcus's mind blown. A woman's real feminine power is not in her looks, but moreso her charm and demeanor, and these older women have been around and know what works.
Look at her face tf
probably forced his hand by threatening to cut him off and/or cut him out of the will 
