Stomach modifications break clothing too. The clothing is made to work for the range given by standard SDT sliders. When mods increase that with larger breasts, stomachs, thighs or butts, then the body parts stick outside the maximum sized clothing. Maybe some day I could so some sort of lactating giant breasted mother or a pregnant woman where they are forced to be naked, but right now every slave can wear any outfit. I don't really want to do work that breaks in any way under normal play conditions.
As for stomach stomach inflation due to too much cum, or cum spurting out of nipples, well, that seems a bit silly to me. I know, I know, I have a demon, a horse, and potions in the bazaar, which is a bit silly and magical, but they are things I personally like :). If enough people say that is something they want, I'll put it on the list. I'll do a poll for what people want next after I get the sister done.
Thank you for the feedback and interest.