To activate the latest scene with Maria, you need to have high affinity and a bad boy. You can get two bad boy points with Maria, making this scene possible on Easy and Normal difficulty.
Sunday
If you apologize for seeing Karla in her underwear, you get a Nice Guy point with Maria.
When leaving, if you pick "No Problem, Mrs Thomas." you'll get a Nice Guy point.
Do Kimberley's yoga scene and wait in the yoga room.
Slap Maria's ass for an Affinity and Bad Boy point.
Tuesday
When you catch Maria after her fall, ask if she's okay for an Affinity point.
When massaging her neck, pick Magic fingers for a Bad Boy point.