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Yes, there is.

Set Character Stomach/Bowels/Womb_Water/air x

For example: Set Yumi stomach_water 9999

Set CharacterName bowels/stomach/womb_capasity x

Examples: 

Set Player stomach_capacity 9999

Set Yumi bowels_capacity 9999

Number can be anything you want, the visual size of bellies however caps at some point and will not get bigger with more capacity. You can modify pretty much any value in the game with the set comand (desires - set desire_inflate; contents of bellies - set stomach_water etc)

In order to increase the capacity of both the bowels and stomach just need to keep filling it up (inflating, eating, drinking) as much as possible and it will increase over time. (Or you can jus use console comands to do it)

Oh right, i forgot that you need to find her first. In order to do that you need to go to the yard (the other arrow in the room with TV and couch) and touch the pink thing that is flying there, it will cause DEB to appear. And after this encounter she will be in her room

In order to encounter DEB you need to press the pink arrow in the room with TV and couch, it leads to her bedroom, where she is present at all times

You need to buy slime pill from Bobby and take it. (Other girls cant take it, only the mc). It will gradually grow and then a slime will pop out, which you can sell back to bobby for good money