I think they numbered her breasts to show that they are just two objects for men to play with. Quite possibly the hottest yet most disgusting illustration of all time. It's hot because of her cute face, sexy bunny costume, huge breasts and generally hot body. It's disgusting because of inflation. Seriously, I don't fucking get inflation fetish. What's arousing about a hot girl having huge fucking belly? Maybe it's similar with preggo fetish, but at least pregnant women are natural while inflated belly is just... fucked up. Why does she even have inflated stomach in this illustration? I guess because she was eating her friend's shit. Nipple piercing and "mutual" scat-feeding actually fall between the middle. The giant ring pierces look painful as Hell and watching her endure the pain makes her look more like a whore. Scat feeding would have been disgusting if we could have actually see their shit, but here, it's only implied that they are being forced to eat each other's scat, which becomes instantly hot. Love the design of the tube and mask as well. The tube is probably directly inside her mouth, so she can't even close her mouth. The mask is so tight that she has no choice but to eat her friend's shit.
Removed 'scat', 'enema', and 'feeding'. Correct me if I'm wrong, but we tag only what we see here: while scat and feeding may be implied, it is not definitively shown in this image. For all we know, the tube is just solid rubber, and this is merely the two characters pretending to perform the implied action.