A comic featuring Tsubasa and Asahi having sex with each other, switching roles and positions, and ending with aftercare while all the others reacting to the whole thing.
I headcanon that Tsubasa has a dolphin dick and Asahi has a tentadick, Asahi's a very kinky train (not in a fetishy way), Tsubasa checks in on Asahi sometimes to make sure he's okay, he is, and they are in a healthy and caring relationship all the way.
PLEASE NOTE: No humanizations, fetishes, or anything disgusting or shocking. I prefer that you keep them as their train selves, thanks. There is some bondage/S&M/BDSM in there, but nothing too extreme.
By the way, the image I uploaded has all the references for the two, and I'm sorry if you can't read the handwriting!
If you want to know what show they're from, here's all the episodes from Volumes 1 to 2 of it on YouTube! (Before any of you ask, even though it doesn't look like it, this IS an anime. It was produced in Japan and aired in Japan, so therefore, it's an anime.)
https://m.youtube.com/watch?v=9U7hZJMuNek
https://m.youtube.com/watch?v=EBngX8c4QmU
With love, Anon
P.S. I ship these two with all my life, I call this ship "Tsubasahi"! >v<
