This is a little strange I guess since they are side stories (and a bit harder to find) but I have 2. ac1r

FOUND
I'm pretty sure one side story is called "the cogwheelers" with a constant showing or reference to the cogs in a clock. I don't much about it except that I liked it and always have trouble ing where to find it (despite having written it down many times). I don't the artwork or anything.

**Ryuu no hanawazurai- Haguruma tsukai (The cogwheeler). Leaving this just in case anyone else is looking for it. Volume 2 chapter 9.5

This next one I have no idea about the name. It's mostly a narrator talking, but a woman walls into a shop. The owner teams her that he customizes hearts, but the customer much choose wisely, because each person only gets one. It can be made of steel, or other metals, the inside also has choices. Basically, the person can put up a front to protect their heart, but it will result in having difficulty with relationships.I think the woman "creates" her heart so that it can be easily hurt but also quick to heal instead of having a string heart that once broken takes a long time to heal.

I don't think these are from my current writers, but they might be. Maybe from Hwang Mi-Ri or Han Yu-Rang, but I don't the artwork as much as I do the stories. Unfortunately, this seems to be my curse, to run into wonderful works, forget the manga/mangaka, and only the story and not the artistry. Anyway, thanks for helping guys, I appreciate it!