This is a technique for people who brought themselves to their first orgasm when looking at a specific picture, movie or anything visual.
If you can remember what you first came to (which I can), then do whatever you can to find it again. The mere sight of it makes your heart pump twice as fast and your blood boils. Trust me, this is the greatest stimulant imaginable.
Glance at it while acting out your regular ritual or simply go all out looking at the one thing.