I Can Write the Fate of Heroines to My Liking!

What if you suddenly received an unusual note? Not a Death Note, though. That'll be horror. My name is Hirosha Yoshikawa, and it seemed like I got transported into some alternative universe, still the same as Earth, but with heroines and protagonists of their franchises. [Congratulations! You've obtained a Heroine's Diary!] [With this, you can control the fate of the heroine to your liking!] Well, that's a bit of a lie. To do that, I was required to write the story following the rules of the existing world, meaning with logic. I can't expect to just sit still like a dumbass and let my magic hands do all the work, can I? First off is Ai Hoshino from Oshi no Ko, my neighbor in the apartment who had yet to do the deed with her eventual killer. You get what I mean? Speaking of neighbor, I had the Angel Next Door Spoils Me Rotten! Anyway, with the World full of beautiful girls, even MILFs (Hard Simp), I'm about to get real with them...! I'll use my magic hands to write magical shit in this World— oh, don't take the last statement too literally. *** Daily or Weekly Updates. Pretty much Comedy. You can't really take it seriously. I can also be straight-up clueless about what to write so I could threw in some shitty things to fill in the Words Target. Remember that. There should be World Crossovers BUT I'll do them as smoothly as possible, with meaning/purpose, not forced, or whatever. You can give me suggestions for them. I'll make sure to keep them seperate each one with Volumes' function from Webnovel. Starting/Original World would be a regular Earth with Non-Fantasy— possibly Fantasy Characters as well in it.