You think you're being careful when wearing a miniskirt, but today you're wearing loose pants so it's okay, right? But actually, it might still be visible! The other person wouldn't expect to be seen either, and might get unexpectedly aroused. They also wouldn't realize they've been watched the whole time, gradually getting into the mood... Since the person didn't anticipate showing their panties, regular underwear is being fully exposed! In fact, this side is more lively and stimulating!
