Translated commentary from the pixiv link:
Title: Incident in the Bathroom

The bathroom in my house is frequented by spiders. I don't like spiders. During the days when they appear, I'll be taking a shower in fear and hoping they will not come near.

One day, when I went for a bath like usual, a spider intruded. I became frightened. And when I was frightened, I started to think. Something like... if only this spider was Yamame-chan. For just a little moment. For one moment with this spider as Yamame-chan. Come on, visualize it. Think it so that both I and Yamame-chan are alone in the small bathroom. And then, after intruding into the bathroom all the sudden, she was staring as my naked body when I was having a shower.

With that thought in mind, I felt a slight mysterious enhancement. Once I calmed down, I looked at the spider with my heart's eye.

And so, I was able to see the form of Yamame-chan clearly, wrapped in a bath towel and said, "Tehe, I'm here again." with an intention to tease. She sat down on the bathtub, and said, "Ah, don't you run today, okay? When I come in, you will always panic and leave. I'll prefer if you don't hate me." with a lonely smile.

Yes, that spider was without a doubt Kurodani Yamame-chan. I've kept running away from her till now, and when that hurt her feelings, I was much saddened. Then, Yamame-chan said, "Now, don't give me such a sad face. I'm very pleased now that you've taken notice of me." with a happy yet embarrassed face.

And thus, we decided to bury what happened in the past and talked with each other. I was curious with her life in the underground, and she took interests with my words. That way, the bath continued for a few hours.

A long bath would be a trouble to the family, right? Taking notice of that, Yamame-chan said, "Let's leave the bathroom. You're going to swell, you know?" with a smile.

When I was starting to regret parting with her, she said, "Shall we meet here again? I will always be here." with a smile. Parting with, "That was fun. See you again", I left the bathroom.

Since that fantasy, that spider has not been coming to the bathroom... Sigh...

F.I.A said:
Since that Fantasy, that spider has not been coming to the bathroom... Sigh...

Lmao! The real spider got scared and ran away?

And Yamame or not, I think spiders are all cute and fuzzy, I love them! Of course having Yamame jump into your bath is an extra bonus.

Oh and before I forget, thank you F.I.A for that translation!

For reference, even though the majority of spiders are poisonous, most spiders will not actually attack a human (recognizing us as something far to large for them to kill), and will run away rather than fight, and for that matter, the overwhelming majority of spiders use neurotoxins which are harmless to humans in the doses spiders can inject. Neurotoxins are paralytic poisons that overwhelm the central nervous system, but spiders have dosages of neurotoxins that are designed to take down creatures like insects whose central nervous system is smaller than a grain of sand.

There are a small number of spiders that use necrotoxins, however. Necrotoxins only attack the localized area where you are bitten, and so, even if it is a small area, it can cause a piece of your flesh to become necrotic, which can lead to further health troubles as the necrotic flesh becomes infected.

Generally speaking, though, spiders are safe, and spiders are your friends. I don't mind letting the one that spun a web over my bed stay there, since it just makes it less likely for me to get attacked by mosquitoes or other creatures that actually WILL bite me.

NWSiaCB said:
For reference, even though the majority of spiders are poisonous, most spiders...

Go to danbooru, look for cute pics.
Learn very important information on spiders.
Thank you internet.

NWSiaCB said:
Generally speaking, though, spiders are safe, and spiders are your friends.

Yep. Like that smelly friend that never shower and that you want to avoid because he never shaves.
Still a friend, but not your favourite friend.