I'd almost say that two part stick out to me the most; the first is actually the first few paragraphs, with a lot of smaller bits and pieces that were funny to me. Particularly "painting WITH sinclair" was funny as hell to me.

The actual answer would have to be a toss up between Don's section and Heath feeling of Faust's stomach, though. Something about Don getting pushed to her maximum, getting pushed further then from that, until she feels fit to almost burst, and then being soothed and caressed and felt massaged... Very good. Especially with having the overtaxxed tummy getting pampered...

As for the Faust scene, I really liked the idea of Heath finding her gut as large as he was, and then some; the idea of her and it being massive enough that he could hardly lift it, but she moved effortlessly while placing him upon it... Feeling as it put her meal to use... Very Very Good. Not to mention him helping to break it up and inadvertently making her larger... And being coaxed to give into HIS gluttony... whete he would then be pushed to become... Yeah.