1: DOM-026
2: ABP-566
3: No idea but https://fap18.net/video/8850092/vintage-japanese-porn?c=all has a much longer version.
4: FC2-PPV-1589814
5: Saka Shiraishi in FC2-PPV-856721
6: FC2-PPV-1659079
I'm getting an error adding pictures, but the top right one is https://www.javlibrary.com/en/?v=javmezqztm
Left one in the second row is a mosaic reduced version of https://www.javlibrary.com/en/?v=javmek3fqy
Middle one bottom row is https://www.javlibrary.com/en/?v=javmeybw4y
Don't know whether they fucked on trains, but they definitely did on busses. Maybe not on a regular line bus in service, could be they just rented a whole bus and filmed on there, but they were riding it through the city during the sex scenes.
DVAJ-681 seems similar, but she doesn't have a yellow bra in any of the scenes. It is a short haired childhood friend with sexy underwear getting creampies though, so even if it's not the one you're looking for you might still like it.
The mentioned WAAA-461 is indeed correct, just check it out here https://jable.tv/videos/waaa-461/?lang=en
The first bit of the posted video is right at the start of the movie.
SAME-149
Just before this shot there's also a morning sickness bit and the girl's mother walks around with a baby bump too (which is why the daughter gets f*cked in the first place.)
I'm afraid the closest this gets to showing the face is:
You can watch the video at https://www.xvideos.com/video.uefbhmdbee4/japanese_uncensored_doggy_style but with some very weird audio of somebody reading from a book or something.
The movie is Heydouga 4017-PPV219. Unfortunately the actresses are only listed as Yuuko and Miwa.
The movie appears online in several parts, the boat scene is in part 2.
If we're talking the big studios, if you want even a chance of a real creampie you will need to look for movies from before may 2017, because around that time every major studio that did real creampies stopped doing so. (Since DASD-504 is from 2019, they're definitely fake). Only a few smaller...
RCTD-644 Left and right girl get a positive test right away.
Middle girl gets a negative test, so they fuck some more before she tests positive. Couldn't get a very clear shot of the positive test, though.
Uncensored or decensored? Because if it is decensored that's not showing what was actually there, just what some AI program guesses was there based on other porn it's seen. Not a reliable way of determining whether something was real or faked.