My girlfriend can’t finish

I cannot get my girlfriend to orgasm. We are both females gay. We try different things, I change my pressure, movement, everything. She feels intense pleasure but she cannot finish. She begins to feel the build up of an orgasm but then it becomes painful. Any ideas or tips? I have no problem getting people to finish, but she is a different story! She is able to make herself orgasm, but previous partners have not be able to. Get your own Orgasm Control toys: For men: For women: