So.. my girlfriend WANTED to try butt sex on New Years Eve. Failed attempt. Long story short- got it all the way in. Didn't do much- got it all the way in andwaited for her to relax before pumping away. Pulled it out- put on more lube, never got to pumping away. Stuck it back in and it hurt her so I stopped. Washed my junk off and got a

as a consolation prize along with "lets try again" and plan better for next time.
She wants/is willing to try again. She is EAGER to try again.... Told her I would do research..... need help. How do I go about this where it it doesn't hurt her? Used a TON of lube.... gonna wait for the experts to chime in. I was thinking ordering a butt plug to stick in and help her relax..... thoughts?