I'm really glad to hear that you enjoyed SSSS! Rather surprised (and pleased) that you liked the prologue and its characters - It's one of my favourite parts, but a lot of people don't like it for various reasons mainly related to pacing + the abrupt cast-switch. It's one of my favourite settings + character sets to write, though.

You chose a pretty good time to read/finish, considering one of the chapters just completed.

Let me know if you want fic recs or anything. Then again, the section for it on Ao3 is still small enough that you can probably find plenty that's relevant to your interests by filtering by characters/pairing and then just browsing through summaries.