This is hot! Did similar with an ex of mine - inserted food into her ass including chocolate ice-cream which would then melt and ooze out. As it was cold it make the ass nice and tight.My fantasy, sometimes played out is to insert grapes covered in whipped cream or condensed milk. Then she squats and defecates them into my mouth. Condenses milk has more of a cum appearance though very sweet!
Same deal with Lindl round chocolates. Her warm anus makes them soft so it looks like poop when it comes out again.