I don't know why Suika in in there, but based on the title (魚類な彼女とイニシアチブ) and the links to the 1., 2. and 2.5 comic, this belongs in pool #2308. (2.5 is not (yet) on Danbooru)
The pool is currently named after the second comic (魚類な彼女とサイエンス). Maybe it needs a better name.
I believe it was canon that Suika could sometimes be found in heaven, which is where I'm guessing they are in this scene. Don't quote me on that though, rather new to the Touhou series.
Even if you say that to me... そう言われても[even if you say something like that, there is nothing i can do about it]Sounds good, right?It's something I've always wanted to try at least once!Whaa!!Carry mee! Carry mee! Carryy meee!-carry you on my back normally...?Why are you doing this to my romance!?Until we reach the Dragon Palace!No! No! What are you saying!?That is...Come now, Iku!Aww why.. Don't you think it'd be cool to be like a Dragon Knight?Although that is what you say...That's enough.Can't I just-To the Dragon Palace!Yes- I'm all set to go! Now, let us depart with haste!Please don't speak unreasonably.Onwards-It'll be fine if it's only for a short while, right?Huh?Riding like this is nice too.That's good to hear.By the way, how far am I going to have to carry you anyway?-a bit farTaking care of kids really is tough.FwoooomRomantic, isn't it?I like obedient children much more.Ah.Eh...Just the act of keeping balance while in this form is exceedingly tiring, you know... I don't even have both hands or feet.