25M. Ex best friend's mom

So I(25M) have been no contact with my ex best friend for years now. Things ended really messy but theres no bad blood. But for a long while now I've had this urge to want to go back and make moves at his mom. She's not the prettiest around and she's married but she's loose and it's known that her and her husband explore outside of the marriage. She's always been kind to me and I've always been like another son to her. But I can't deny the deep urge I have to want to have sex with her. Thing is, I know she'd be down because once she has a drink in she's very flirty and more herself. She's given me looks before and made "jokes" but they were always just that out of respect for my best friend. But since we're not friends anymore... I figure why not give her some younger dick. I know she'd love it.