Taking a deep breath, K sucks his stomach in as far as he can while doing his best to show off his ribs. The move is called a stomach vacuum and it is a favorite of people who have a rib fetish. - HfK studios, hetflexk, heteroflexible, heteroflexkblek, xdress, crossdress, cross dress, bisex, bi, gay4pay, older, mature, skinny, thin, muscular, vascular, closet, exhibitionist, amateur, straight, tranny, trans, transvestite, twunk, ecto, ectomorph, slim, veins, veiny, vein