What a twisted scenario brought to life. You see, this guy has a girlfriend, the said girlfriend has a sexy sister. The guy is left alone with the sister's sweaty flats and whadda you know – he starts sniffing them while jerking off vigorously. The girl busts him, she is grossed at first, but then she warms up to the idea. She takes off her flats, lets him sniff and worship her sweaty feet before she lets him fuck them. She gives him a passionate footjob while he squeezes her tits. The guy blows his load in the end. The end!