It worked.

"Mmm...I can feel the skirt getting tighter! Are my hips getting wider?" You put your hands there to find them expanding!
"I think you've just added 20 pounds per cheek here," Kako tells you. You feel your inner thighs touch and press together, despite being spread as much as possible, due to the cum that ran down them. You pull yourself upright easily since the spurts hitting your back must have increased your muscle density there.
"So, is that all for now?"