Secret laboratory - 30 (Patreon)

Claire leaned forward a little bit and grabbed Danielles right boob to examine it. While she was holding Danielle's boob, it still grew slowly bigger and bigger. 

Danielle: "Hihih ... my boobs are now bigger than yours..."
Claire: "Of course they are, and they are still growing. Do you feel it?"
Danielle: "Like your hands gettings smaller?"
Claire: "What is of course impossible, but yeah, thats the effect of your boobs getting bigger and bigger."