This could be a side effect of diuretic medication, which aims to reduce excess fluid in the body. In the weight-bearing leg it acts similar to the tibialis anterior. In this stage of the gait, the knee will generally, but not always, track laterally of the hallux. Foot fetishism is the most common form of sexual fetish.
It is also known as flexor accessorius. Don't ever assume that you'll be able to 'break in' uncomfortable shoes — you should be comfortable immediately upon trying them on in the store. So, next time you have a minor problem with your feet, take note.