I enjoyed these. Are there any more of this, maybe the other seasons?

I don't see anything else, but a lot of people seemed to enjoy it, so maybe there will be in the future.

Also, this first series was only posted to Pixiv two days ago, so, y'know, patience.

Well, this is apparently running in Manga Time Kirara now under the name Futari. (ふたり。), so good for him.

That is indeed excellent news. I shall have to seek out that title.

That's awesome. I'll have to remember this next time I go buy stuff.