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9: ...Today I had a talk with the teacher at the school...
I was told that the little one might be a little strange...

'kawatteru kamo shire nai' in this case refers to 'being weird or strange, not quite normal' rather than having changed.

4: Hey, like I told you, I'm not dirty.

Is there a name for this series?
If not, how about "Marisa's Decision"

[He~y Marisa, I'm home...but, why are you acting surprised?]
"Yu...! We-welcome home, Onii-san..."

My translation might be a bit off; kind of not thinking straight.

Usually, the parasite extends tubes full of eggs into the antennae of the snail, which enlarge the antenna and pulsate. Most likely that's what's going on here.
So, the eyes are still eyes, but they've been forcefully expanded by the parasite's body.

I had to make an account, just to tell you harouki.
Hananero's are a type of hot chili pepper, with a higher Scoville rating than Jalapeno's.