A few ideas: A feeder/feedee couple sequence showing the increasingly creative ways the feeder has to come up with in order to feed their feedee as they gradually become bigger, rounder and tighter.
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As usual, I always jump at the chance to draw a pairing of the Overlord and Beryl in these situations. Here we have an unspecified period of time where Beryl wants to get fattened up as a gift to him but gets carried away by her lust and gluttony like usual, leading to some very sexy scenarios~