Help with supporting my girlfriend in better sex

Hello....

So my girlfriend and I have major chemistry and a connection. When we have sex it’s passionate and best sex ever. But... when she finishes... she finishes quick and ahem I’m good at what I do.... she doesn’t finish me because she’s pretty much TKO. So...

My question is how do I approach the conversation AND how do I teach her how to use her fingers better when she’s never been one to masturbate because of early child trauma. But she’s comfortable with me.

How..? Help... 😅