It may not only be milk in the breast but also fluids in the abdomen passing through the throat or other openings
can we change the background, now the heroine is in the domain of tentacles (I don't know), you can make a background of space, a background of a robotic laboratory (possibly with thematic manipulators that you can't just buy\choose), perhaps the mouth\stomach of a huge monster, maybe a milk factory, if you have an idea, throw it in too