Though everything I could remember about canon I wrote in a diary I stored in Shadow Storage.
I filled and stuffed the diary, which was the biggest compromising material on me, while hiding under the bed and in the closet.
This of course added worry about me for this body's dad, but it made Venelana happy and let me worry less about being caught using a sacred gear and them finding compromising material pointing to me as someone transported.
And of course I sorted through the inheritance from Ren.
Most of the magic he studied went down the drain due to grown power and control drop, but the alchemy he was more into than magic stayed with me in full.
Generally Ren was an absurdly unambitious demon, in this we're similar, his dream's limit was creating useful potions and trading them to provide a comfortable life for his mother and himself.
He only pushed himself in magic and studied and trained like crazy because his mother liked it.
No, she didn't push him or force him, and if Ren said "I don't want to study magic!" she wouldn't force him.
Ren just saw how she rejoiced at his successes and wanted to make her even happier.
As for me, I decided to slack off on magic.
No, magic is cool and all, but I wasn't particularly excited about it, and I wasn't planning to become the strongest.
The prospect of staying a middle-class demon, getting lost somewhere in hell's expanses, opening a shop there and trading potions I really had a soul for suited me fine... though Ren's soul was into it, and that transferred to me.
But all my plans and hopes for quietly living life, watching canon events from the back rows, went to hell.
Zeoticus once again barged into my room.
"Ren! I got the gift I promised you!" announced this body's dad, bursting into the room without knocking!
It's because of stunts like this that I hide in the closet, to be able to secretly hide the "diary" in Shadow Storage.
"Gift?" I racked my brain since I didn't remember anything like that.
"Yes, you asked for cats!"
"Um..." I vaguely remembered something like that in the first days.
Zeoticus asked what I'd like and offered EVERYTHING.
Frankly, some of the offers were absurd in my opinion.
But for someone at Zeoticus's level, a child's request—I want a car—could easily turn into buying a dealership selling premium cars, or a factory producing model cars, or a workshop creating an exact miniature working copy of a real car.
I think he really could've pulled something like that to snap me out of the state I was in then.
I really was remembering my past life, where I had one regret—Minnie, my cat!
She really pulled me out of depression or smoothed bad moods, climbing onto my lap, getting comfortable there and starting to purr like a tractor!
After getting relaxation I'd forget about all problems, or they just didn't cause such negativity.
And I really missed my Minnie then, which I said to Zeoticus without thinking.
No, I didn't say—I want Minnie, I said I'd like a kitty, cute and playful.
"Here, they're yours now!" announced Zeoticus, opening the door to the room where two nekos were.
"O_O..." I freaked out!
No, I FREAKED OUT!
Because in the room were Kuroka and Koneko!
Kuroka currently looked about sixteen, while Koneko, who most likely isn't Koneko yet since she'll get that name from Rias, looked about six or seven and was trying to hide behind her older sister, though she was peeking out with curiosity.
Zeoticus was clearly pleased with my reaction.
Well yeah, I usually had the expression of a thinking brick, a voice devoid of emotion, and dead fish eyes.
I achieved this effect with skills inherited from Ren's mother for keeping a straight face... servants were specially trained for this... my own habits, plus a couple potions I cooked up and used secretly.
Yeah, Ren's stuff wasn't damaged, and he was bringing a mini lab and tons of ingredients with him.
And all this was delivered to my assigned room, where using the acquired skills I brewed myself "Stoicin"—like a SUPER strong sedative that suppressed all emotions leaving an almost crystal-clear mind.
It let me not panic and also get rid of Rias's interest in me.
Though I started reducing the dose, otherwise my condition was starting to be taken for some illness rather than shock.
And right now I wouldn't mind popping a dose of Stoicin, but it, along with a couple other drugs they'd definitely confiscate, were in Shadow Storage, and until I got to my closet or sat under the bed, I couldn't use it.
But the potion suppressed the initial shock, and I started thinking clearly.
That canon got seriously broken by my casual unintentional words was bad of course, but not critical.
Maybe there'd even be more plusses.
Judging by everything, Zeoticus managed to intercept the neko sisters before they fell into the hands of a certain demon who'd turn Kuroka into a demon, get the desire to conduct some horrible experiment on Koneko, which is why Kuroka would tear him to pieces and run away.
As a result, we have Kuroka branded a criminal, Koneko with psychological trauma that almost cost her life and clearly buried part of her potential, since she ignored her nature and the powers it granted for years.
What does this change for canon?
I think VERY much... honestly, this "butterfly" I killed with my thoughtless request, from which I expected at most they'd bring me a magic kitty to become a familiar, was the size of a Boeing, and its fall brought equivalent destruction!
Though no, globally nothing will change!
Well, Rias will have one more piece, instead of one Rook, two!
That won't break canon much.
Or Kuroka will be in reserve for Rias, and will later also fall for Issei.
Generally, about Issei and how he collected his harem, there are suspicions... read in several fanfics about dragon aura that attracts girls, but I think that's all nonsense!
It's more likely about the Boosted Gear and Issei's subconscious desires, plus circumstances.