Use the underwear.

For better or worse, you have nothing better to do today, same as yesterday. You wake up feeling a little groggy, and after a good breakfast and refreshing coffee you end up just sitting around for a bit. You take this moment of rest, as you are sure you'll need it before you get started.

You sit there for a while and then a while more, gathering courage to do what you are planning to do, until eventually, you gathered enough. You end up wasting this day away as well. You wear the shirt again, sniff the shorts, and keep the underwear on the sides at the start. The scent from the shorts however begins to tire, so you grab the underwear. Although the scent isn't the same as the one from the shorts, this scent being more mixed with your own, the amount you sweated into it and the heat you exuded during the run really give the underwear a boost in terms of smelliness. The hint of Robin's scent in the underwear, boosted by your own, is stronger than Robin's scent in your shorts. You end up doing things with the underwear you didn't think you had in you at the beginning of the day.

Your **** to use your underwear as a sex object yesterday has turned into complete sexual deviance as you suck the cloth, put it over your head and jack off with it. Such deviance comes with a price however, as the scent has worn out of the clothes leaving you longing for more.

Today was monday, you are meeting Robin tomorrow.