Mil

- your MIL has a healthy relation with u.

- shes 59

- shes got grey hair, long legs, big breasts.

- you are regularly online with her. chatting.
you flirt a lot with her. sometimes shes ok. sometimes she gets really angry.

- staying at your MILs place. you get to see her in night gown.
you take pic of hers whilst shes asleep. her long smooth legs

- you share the pics with her. you dont know why u did that. but u do

Someone please develop the story from here

nice

Taking pics n sharing with her part will really give nice twist

In flirting part we can show how gradually she start to love flirting

of course, she flirts. but shes drawing her own boundaries.
thats the barrier to be crossed. we need a storyline to that effect