"No, they're products have no weird side effects" You say
your girlfriend cracks opened a bottle of water as the two of you start walking to the Change-mart "You sure? it seems like everything there does something weird." she then takes a sip of water and her breasts grow. Your girlfriend needs to hydrate but the water she drinks makes her breasts grow to an uncomfortable amount each day. It only lasts an hour or so at most, but it was concerning in public.
"Trust me, I know that nothing in the Change-mart has any side-effects." you try to tell her... everything in that store had absolutely no side-effects, but your mind having gained new information from another world knew that everything else in your world had weird side effects... Like your girlfriend's water growing her tits or...
"Mind hitting the sidewalk button?" your girlfriend asked as you were about to cross the street to the change-mart. You sighed and hit the sidewalk button as a small discharge of electricity shocked you and your whole body shifted. Your dick sucked in, your chest blew out, your girlfriend gave your boobs a quick grope, and your whole sex changed for all of a second till the energy in your body dissipated and you reverted.
"You know for that second I am a woman."
"And I'm a little bit Bi, you don't mind me indulging in that side when your shocked instead of cheating right?" Your girlfriend asked in a sarcastic tone. You sighed again as the two of you entered change-mart where...