I was thinking, adding stomach sounds to moments where it mentions a girl's fullness like after a huge meal, stages in the pub quiz, eating contest, during tube feedings and etc.. There are plenty of small asmr youtubers that make videos with mind melting stomach sounds. Highly recommend belly sounds and other cooing vocalizations.
I have plenty off other ideas. Some may be stretching it. A dairy milking rig to make tube feedings extremely stimulating. A fatty farm as an alternative to the care center, but for smaller girls dedicated to the gains. milkers... maybe...