[FeeltheRez]

This one is a bit humiliating but that should be appropriate. You'll need a 2.5 inch in diameter nerf (or other squishy material) or foam ball, please disinfect the outside before starting. (Rubbing alcohol helps lots)
Before you shower edge however you like, then insert this ball into your pussy. While in the shower scrub around your crotch and clit thoroughly while you tease your nipples. When you have 5 min left in your shower squat down and keep your legs spread wide. You have to tease your clit mercilessly while trying to push out the ball at the same time. Now your goal is to push it out at the same time you cum, if it comes out too early then you will be punished, if you cum too soon the same will happen. I wonder how you'll enjoy this if you do it.