In my defense you asked for webtoons and I gave you webtoons.

Princess of Sylph started as an online pixiv fanbox manga that then got published, but it didn't sell super well so it got cancelled. The author said that it will continue as a fanbox manga like it started and the fanlation team for the series is pretty dedicated (they translated both the published and online manga in full or close to it so far). The published manga is a reboot of sorts for the story compared to the pixiv one (to make it more gay) and the continuation is planned to continue from it rather than the original.

Reading over the author lists, no, there's no relation between Eclair and that series.

Trying to think of other series since I'm clearly so bad at this.... I guess I could give you a bunch of Mariari doujins? Since it's my favourite touhou ship and I read a lot of them but that's not really being helpful considering you can find them just by hunting that ship in particular...

This is hard everything is either not good enough or popular enough that I feel you've probably read it...