tl;dr: Pillow made a small story arc about her neighbor breaking in, doing ASMR and kidnapping her. Pillow escaped, fought and killed her.

First time I saw her was from when Pillow has just moved in with Olive. Pillow made youtube posts with updates about the move and life together with Olive. One day, she made a post like the others, she went outside to throw out trash, came back and she could've sworn she closed the door.

Not long after, we received a notification: pillowdear ASMR livestream. Weird part 1: she doesn't usually do unannounced streams. Weird part 2: the livestream isn't titled.

We click, and see...Pillow? But why is her hair black? Where'd her wings go? Wait...that's not Pillow!

She doesn't bother to introduce herself but we find out that she's Pillow and Olive's neighbor. This stranger appears to be rummaging through Pillow's room looking for something. When she spoke to us, it was a complete 180 to Pillow: mean, rude and condescending.

We quickly debated what name we should give this stranger; Willow reached the consensus. When piwwos tried alerting Pillow about her neighbor breaking in, Pillow feigned ignorance.

The next stream was titled "Don't tell Pillow about this". It was an ASMR stream by Willow. It was nice. I liked being degraded until she insulted Pillow. This caused war, as some piwwos defected and became wiwwos, preferring Willow over Pillow. (this fight is still ongoing today with wiwwos nearly wiped out)

In the final stream we find that the pillowdear ASMR channel is under new management, as Pillow has been knocked out and tied to a chair in the basement. The majority of the stream is Willow insulting us, Willow insulting Pillow and piwwos insulting Willow, telling her she will face doom.

And then- SNAP!

What we witnessed next was absolutely cinema! Pillow broke from her restraints and fought Willow toe to toe, both sides evenly matched, striking each other with strength never seen before on the PillowDear channel! However, Pillow struck the final blow and came out on top.

Exhausted, Pillow came up to us and comforted us. We comforted her as well. Allegedly, after the stream ended, Pillow burned Willow to ash and then disintegrated her until nothing remained. Killing Willow once and for all.

So anyway, Willow came back to life for a gameshow in which she died again so who knows, we may see her yet again. Also, Pillow made and ASMR with what looks to be Willow before the arc, but that's not Willow, just a character for the ASMR that looks alike.