Helppp!!

I wanna invite my mom over and then tell her she looks uncomfortable and offer her to put on a pair of leggings so she is more comfortable and then tell her she has a nice ass and try to make a move. But I need help on how after I tell her her butt looks great and the leggings look good on her as well!

How can I go about doing this? What can I say or do to make my chances better??