Use the arm to cover the breasts, not just palms.
The breasts are distorted by the pressure of the arm.
When adding the "large areola" tag, maintain the pose, and allow the areola to peek through the arms or palms.
Trigger word:
udebura
Helpful tags:
covering breasts
large areolae, areola slip
covering crotch
Negative:
extra digits
Usually, the udebura can trigger the pose without using the covering breasts (because it might result in a palm-covering pose). If you're having trouble triggering it consistently, try this.
If you have more fingers, try adding extra digits to the negative; this might be helpful.