Next time you need to piss, soak your pillows (or pillowcases) and let them dry. Keep the pissy pillows for at least 3 nights before washing.

You must get 7 pairs of socks and 7 pairs of underwear. You then will put these into a bucket and piss into the bucket (multiple times if you don’t think there is enough) you will then let the socks and underwear soak in the piss for the next hour. Then for the next week each day you have to wear a pair of these underwear and a pair of these socks.

Every day for the next week, do a sweaty workout. Don't change underwear at all for the next week. Every day, you must do a 15-minute underwear gag.

Wear the same pair of underwear all week. Cum as much as you want, but each time you cum into this pair of underwear. After 1 week, put it in a zip-lock bag and cum once more just before sealing it.

Then take a fresh pair of undies and pee on it, make it thoroughly soaked. Place it in a zip lock bag as well. Put both bags out in the hot sun for an hour or two. If there is no sun, wait for another day.

Then blindfold yourself, wear thick gloves and switch around both bags until you lose track which one contains which undies. Pick one at random. That's the pair you have to pull over your head. Enjoy the smell. (Oh and tape your mouth shut, only breathe through the nose.)

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fyi, I was made to post here (but this does not mean the next person should go easy on me).

Do some sport. At the end, when you will be back home, all sweaty, you will have to take one sock and put in your mouth as a gag. Then take off your underwear and use them to wipe sweat off your body. Now wear your sweaty underwear on your head. Stay gagged for X (roll a die) hours. You're not allowed to take your underwear off your head until tomorrow (wishing you a smelly night). You can't take a shower until tomorrow as well.
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Hoping you will enjoy your forced post !

You will put your underwear, a pair of socks and a can of tuna in a zippered bag. Put it in the sun for two days and then use them for 24 hours.

You’re going to buy 5 different stinky cheeses, and try to identify which is which based on a blind smell/taste test. Every time you don’t get all 5 right, you’ll have to wash your mouth out with soap to clean your palate, and try again.

If you fail 3 times, you can give up and put all the left over cheese in your underpants for the day <3 smelly butt.

Next morning, you will have to fill your underwear with sardines and go about your day. At the end of the day, you will take off your underwear, eat the sardines and wear your underwear on your head during the whole night.