All things considered it was a weird specific button to have on the remote, but as Calvin pressed the button he saw Tia leaning closer into Zoe mostly as Zoe's large breasts were shrinking into nothingness allowing Tia's head to exist in what used to be an occupied space. On the other hand... or rather chest Tia's dress was being lifted up as her breasts grew and grew as Zoe's breasts invaded her chest.
They both stared down as Tia quickly tried pulling her dress down as the collar's fabric started to tear and her new boobs were threatening to flop out the top. Zoe panicking saw Calvin with a weird gadget in his hand, but concerned said "Calvin, get you sister a towel or something quick!" Shifting around a bit Zoe got up and then felt her bra start flopping down as her tiny nipples got exposed as her neckline lowered without any breasts to support them. The older girl blushed uncertain what was going on.
"Two towels on the double!" Calvin said as he quickly turned around and smiled. The remote worked... now maybe if he could experiment on the awareness or something.