Anal orgasm

Hi guys,

Recently my gf and I have started to explore anal sex. We’ve been using butt plug during PIV and its has been amazing ( she said the orgasm is faster and more intense) and she cannot have an orgasm without it anymore.

Now we would like to try anal, so far she said she cannot feel anything during anal sex. So far what we’ve tried

  1. Lots of lubs
  2. Make sure she orgasm with vagina few times before going anal.
  3. Put my dick completely and slowly, only move out few inchs and dont pull out completely.
  4. We did missionary position, and my dick is hitting the thin layer wall that separating the anus and the vagina.
  5. Lots if warmup and fingering beforehand.

Can someone help youe brother out here and tell me what should i do to make it pleasurable for her?