Una tarea humillante secreta para sub valientes

Oooh I've got a little secret! I have had the best idea for a little task for you! You're so eager to find out what it is that you're almost dripping aren't you? Well that's a good start but why would I give it away completely in the description? After all you do like being edged don't you? You are going to need a few things for this one; yourself of course, a permanent marker and your brave sub pants. I know you're curious... So come on then, be bold!