Specific Alternate Universe Fic - 3 universes meeting

[tealrose39.livejournal.com]

I've been trying to find this fic I read a few years ago (probably in 2009) that was basically a giant alternate universe meeting. It was a long fic with maybe 4 parts to it. The three universes were TOS, Reboot, and Mirror, and they all somehow end up switching crew members.

Here's what I remember:
-At first nobody recognizes the crew member switches and they happen for a steady period of time
-As they get closer and closer to the (space anomaly? time/space tear?) crewmembers start switching in and out randomly and they all start knowing what's going on
-Mirror!Checkov sleeps with other! (I forget TOS or Reboot) Scotty to get the command codes to conquer the other Enterprise
-I think the universes were referred to as Prime, Alpha, and Mirror but I don't quite recall

Anyway, hope this sounds familiar to somebody!! Thanks for help in advance <3

Looking for STID rec lists and specific fics

[scarlettmoon.livejournal.com]

1) EDITED - Specific fic is from 2009 movie, k/s. I think from spock's pov as he learns more about kirk. I think Spock followed kirk and found out kirk has sex with this alien woman for comfort/to eliminate his emotional pain (from tarsus iv???? I think she was on tarsus too and that's when she started comforting him) and she was more of his counsellor/friend. I think she absorbed the pain. I get the feeling the fic showed Spock learning how great kirk is and how much pain he buries, how deep he is... So Spock's changing his initial impression and falling in love. Any other stories where Spock is learing kirk are also welcome.
Secondly, looking for fic where kirk goes ocd and starts writing math on walls as he is compelled to figure out a solution/alternative to his father's death. - FOUND in comments (angelbaby is awesome)! Thanks Pippopippo! And thx for the recs. I'll check out that fic too silverharbringer. Thx for commenting.
Third, looking for any k/s or kirk/khan fics where their love is obsessive/jealous/possessive, or others think as unhealthy. (what was the one where Spock was walking fown the hall saw Uhura touch Kirk's arm and went a little crazy, manhandling her away from kirk? Probably pon farr. They weren't even together yet. 2009 fic)
Also looking for rec posts that rec fics based on the new movie (can include xi and tos). Would love it if the reccer is continually updating. Can be on lj on off. Prefer kirk/anyone, esp k/s, kirk/khan.. Kirk/chekov....
Thanks in advance! I can't thank you individually in replies as my phone is limited in capabilities... But comments are appreciated!