Panties

The word that appears at the bottom of the paper is 'Panties' which confirms your suspicion that this had to be some kind of joke. You actually smile to yourself as you grab a towel from your closet and head to the bathroom you share with Tristan to take a shower.

The warm water of the shower is refreshing, and the whole paper on the back of your door thing slips your mind, that is until you get back into your bedroom wearing only your towel. You open your underwear drawer to find it empty of all your boxers. This drawer is instead packed full of panties of various designs and colors. You do a double-take, thinking maybe you are seeing things, but nope, all you have to wear as underwear now is panties. You even appear to have a couple bras to go with them.