Damn, that sure looks like it's the end...

Well, this is the piece's commentary from the Pixiv page:

ちょっとだけおっきくなったよ！な夏の永遠亭

タグ「こどもこ」って……！！！ツボにはいりましたｗ嬉しいです！ありがとうございます！！

Commentary said:
They just got a bit bigger! Summer of Eientei
What "child" tag...!!! They got in the pot lol it's fun! Thank you very much!!

I'm not exactly sure what that pot means there, it may as well be trap, but I'll assume he's referring to the part where Mokou and Keine are in a pot. I'd be grateful if someone could check my translation...

NeoChaos said:
Well, this is the piece's commentary from the Pixiv page:

It's a "They've only gotten a little bigger!" summer at Eientei.

And that "Mokid" tag...! It's right on the money. lol I'm so happy! Thank you so much!!

"Mokid" = "Mokou" + "kid". The original tag is "kodomo" + "Mokou" = "Kodomoko".