Me... and my boyfriends Mom.?

alright. so me and my boyfriend have been dating for about a year and a half. me and his mom i guess are kinda close like we go garage sailing together... and i wanna be closer. She only has boys and devin (my boyfriend) says that she would love it if i used her as like my mom to talk to her about girl things. especially since i cant really talk to my mom about things. for instance, i would feel so much more comfortable talkign to her about than my own mom. But i want to talk to her about things that a mother and a daughter talk about. can you help me think of some things like that. Thanks=]