You return your attention to the laptop.
After some more reading, trying to find the things that different from your original reality, what strikes you is not what is different, but what is the same. Almost everything.
No notable historical figures born from men, no significant changes to gender roles. Nothing, like this reality is just a slightly distorted mirror of his native one. It didn't really make much sense any other way, either this alternate reality was created the moment you were sent to it, based on your own or some thing made it stay in sync.
The biggest differences were around how bare boobs were viewed, overall people were more relaxed about it in media, but you'd still get a significant reaction if you tried to go out topless. That just applied to adult men as well as women here.
You shifted your legs a little to adjust your position. The movement tugged at your vulva and your labia slide along each other just a little.
Now that you knew what was down there it was becoming easier to put labels to the unfamiliar sensations going on, which brought them into sharper focus. The novelty making your brain pay more attention to them, so you were hyper aware of all the movements going on, the constant slight moisture, space inside you. Many internal sensations remained vague and formless, you assumed they were from your ovaries and uterus.
That was a strange feeling, acknowledging the existence of *your* ovaries.
That brings your thoughts back to that surge of female arousal you felt earlier. You can't help your curiosity. What does it feel like to be properly aroused that way?
You open an incognito window in your browser on the laptop. For a moment you stare at the address bar, unsure what to type. Somewhere from the back of your mind some information arises. You know what this alternate you likes to look at when in a female mood.
In a few minutes you have something pulled up. A curvy, busty, well-endowed woman, tit-fucking a busty man filmed from his point of view.
The video starts slow, with the woman stroking her cock, moaning softly. You just watch at first, feeling yourself get wet. Your clit swells and stiffens. You can't take your eyes of the woman's large member. Your desire grows, you start massaging your breasts through your bra. The sensation is pleasurable, but weak. You quickly undo your bra and slip your hands underneath the cups and start rubbing and squeezing your tits directly. Your fingers pass over your erect nipples, causing you to gasp at their sensitivity. You also notice all your chest hair has vanished, apparently a normal part of the second puberty in men.
Down below your pussy gets wetter, and warmer, blood rushes too it as your body goes further to it's female side. Your male parts haven't been entirely lifeless, but those familiar sensations are less stark by their familiarity, and now you've reached the tipping point. All your male arousal vanishes from your awareness, your penis and balls pull themselves into your body, out of the way.
You have gone into female mode.
The back of your mind offers up that you'll likely stay in female mode, even once no longer aroused, for at least an hour, possibly two. Some people return to neutral more quickly, but you tend to stay for longer than average.
You moan softly as your female arousal becomes the only arousal you are feeling. A feeling of need, of emptiness between your legs rises in your awareness, you know what your body wants. It feels alien to want it, to want a cock inside you, but you want it all the same. The woman in the video has straddled the man's body and he is pushing his breasts together around her dick. You reach down between your legs, this time your own penis is not in the way, you have a clear path to your vulva. You slip a finger into yourself. This helps with empty feeling, but not much.
You start to work your fingers in and out, rubbing inside yourself, putting pressure on your clit with your palm at the same time. Your moans become a little louder and more urgent.
Then the buzzer goes off. Letting you know someone is downstairs to see you. Your girlfriend. Your plans with her for the day haven't changed from your native reality, the little source of information about this reality in your head offers. You were still planning to have sex for the first time today.