I look up to raw chapter 9, but there is still no Villainess. The flashback show his Nemesis and the decease family. But he himself in not in there. Was Aaron originally a born female?
EDIT: Now the 'Villainess' tag was gone. I just overthinking again.
『激おこぷんぷん丸!
である
This is what she said.
pun pun (sound like boiling steam. but now a day most peoples use electric kettle, so 'beep beep' made more sense, I think)
If the culprit and his accomplish are arguing. We can see two men talking to each other in chapter 3. The glasses wearing butler should have no part in the murder scheme. Also, this is an original manga by Shueisha, not an adaptation from a web novel.