Robin and the expand gem

The expand gem is no ordinary jewel. When it's placed between the chest, it expands the breasts and thighs. Nami apparently found it one day. Robin was the tester, cause
the gem slipped out of Namis hand and into her breasts. Now Nami couldn't believe what she saw, and wanted to try it next.

Hope you like it.

Nico Robin - One Piece