Dude your nasty. I'd suggest that you don't even go over to that friends house anymore. Stay away till the feelings die down u know? You are only 12! You shouldn't be thinking about having sex with anybody at your age let alone your friends mom. U need to sort things out, because that is really really creepy and odd. There is no way she would do that with you. And if she does then that's a big warning to stay away. Dude. Eww. That's nasty.