Yeah. That's right.
Take the underwear - best if smelly if you can take it! - and stuff it in your mouth. Use a string to tie it so it won't fall out...!
You got that filthy stench in your nose...? Good!
Before you cover your eyes I'll tell you what you need to do:
YOU WILL BLINDFOLD YOURSELF AND EDGE...USING ONLY YOUR NON-DOMINANT HAND!
But STOP before you cum! Just wank till you're right at the edge!
----Then ---->