I know that feeling. I'm stuck on the 1 and out thing too. It's all mental, but I've accepted it. Satisfying her really depends on how lazy I am at the time.
I've learned to incorporate more four play into the sex session. More licking, touching, massaging, dirty talking, etc.
Get her hella wet, then dive in.
I mean, having sex with the same chick can be mad annoying, but it's really hard NOT to satisfy her after you've learned her and her body so well.
And the sessions I do with my girl usually last a couple hours anyways. (Unless the session was deemed a quicky from the start). My girl cums mad easy too,
so she'll bust like 12 nuts vs my 1.
I dunno, it's not hard to satisfy a chick that you know VERY well.