This just hasn't caught on in Japan. As in, I don't think it's even a thing that most Japanese men are conscious of existing as a fetish that people like. However when it does happen it seems like it just happens naturally, as in if a woman is doing anal she doesn't really care much if she gives a blowjob. Of course almost all mainstream porn has the actors wearing a condom during penetration and taking it off during oral sex so it probably wouldn't satisfy you.
One that might satisfy you is the Tokyo Hot series. Those videos always have multiple guys come inside of a woman, and usually they show the girl cleaning off his dick while the next guy starts putting his inside. Most Tokyo Hot videos with anal sex also have the woman cleaning off the mens' dicks after they finish just like the other ones. This week's video, n0972 with Rina Uchimura (she uses the name Miho something) has a lot of ass to mouth near the end of the video. And again, most Tokyo Hot vids with anal sex have ass to mouth.