Change #1: Women have huge breasts and want to have larger breasts. A woman's social standing is based on breast size.
That was the first change you put into Dr. Smith's interdimensional portal device and stepped through the shimmering vortex that appeared before you. Now you were here, sitting in a Starbucks, staring at a pair of tits that probably weighed as much as the rest of the women they were attached to.
"--anyway, that's why I'm hoping that my boss'll approve me for some growth hormones next week. It's not a full promotion, but it'll mean that those bitches in Sales will have to listen to me when I talk."
"Mmm-hmm," you say, only half-paying attention to your date's words as you stare at her chest.
"Oh. Sorry, is there like a stain on my shirt? You've been staring at my chest for a really long time."
You look up, blushing. The social norms of your old universe haven't fully left your subconscious yet. Still, things were different here. You might as well be honest.
"Well, uh, it's just that you have really nice tits is all," you say, averting your gaze. "Seriously, those things are huge. It's really hot."
Your date--you think her name is Tara--squints at you, cocking her head in disbelief. Her eyes twinkle with cautious arousal.
Change #2: Women, particularly busty women, get off on the idea of somebody being aroused by large breasts or breast expansion.
"I--oh my god, seriously? You're um. Sorry, I have to make sure," says Tara. "You're not a woman, right? Because if you are, like, you're nice and all, but dating somebody so flat--"
Change #3: No man, save for me, is aroused by women's breasts in any way.
"No, no, I'm a guy," you say. "It's just that, y'know, damn. Look at these things!" You reach across the table and squeeze Tara's boobs, relishing the moan that the gesture elicits.
Change #4: The larger a woman's breasts are, the more sensitive they are.
You continue to squeeze, casually rubbing one of her rock-hard nipples through her top. "Has nobody ever done this to you before? Because they're missing out."
"Only--only--hah--a couple sorority sisters and--hah--oh--oh fuck oh fuck oh fuck!"
Tara arches her back, as she cum the sudden shift in her center of gravity and her wobbling tits toppling the table towards her.
Change #5: Public sexuality is acceptable for women with larger-than-average breasts. What a woman can get away with scales with breast size.
Tara grabs your wrist with one of her hands and looks at you, a hungry look in her eye. You notice that her other hand is beneath table. You hear a faint, wet, rhythmic noise. "I'm going to take you home, tie you to my bed, and make you suck my tits until I pass out with your head lodged in my cleavage, and then I'm going to tit-fuck you until you cum your fucking soul out."
Change #6. Women are socially and sexually dominant. It is expected for a woman to make the first move in a sexual relationship, and it's rarely subtle.
"I think I'd like that," you say.
"Good," says Tara. She's breathing heavily. A thin trickle of saliva runs from the corner of her mouth. She idly wipes it away with the hand that isn't grabbing onto you. Her fingers glisten. "Because I wouldn't stop if you didn't--"
Suddenly, Tara lets go of your wrist and slaps her forehead. "Wait! What the fuck am I saying?"
You wonder if your date is realizing how far she's letting herself get carried away. You're about to reassure her, when she suddenly continues.
"You haven't even seen my boss yet! Or my CEO. God, they make me look flat!"
Change #7: Women get off on sharing their lovers with others, particularly their social superiors.
"That's it! I'll take you in front of the C-suite at my company, explain what's up, let them pass you around like a joint, and when I get you back, they'll have to let me get those growth hormones! Hell, they'll probably promote me on the spot!"
"And then once I get the corner office, I could give you to the mayor, or the governor, or the prime minister--" Tara continues. Her hands are back on your wrists. "I bet I could get as big as I wanted. As big as I deserve. I bet I'll rule this fucking world by the end of next year. And then--" Her grin is crazed with equal parts lust and megalomania. "The sky's the fucking limit."
Tara grabs your hands and leads you from the cafe, running as fast as the weight of her tits will allow.
"Uh. Tara? The sky's the limit metaphorically, right? Right?"
She doesn't answer. You make a mental note that if you ever get back to your home dimension, you need to tell Dr. Smith to never send test subjects into other worlds without a means of escape.