If you liked my mods and want to show your gratitude, you can send me a donation.
hipolink seems to be the only option i have for now, so i created a hipolink profile, you can try donating me there if you wish to do so ;D
https://hipolink.me/fluffyspider

Main Info:

Someone wanted a mod like this, so i made one. 

It affects all "scared" facial expressions, changing them to "neutral" ones. It may also affect vanilla npcs that use faces available to you in the character creator. Should also work with modded faces.
Let me know if you want it to be added for other races.
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[Replacer version for AA kisses]
Also affects facial expressions that are used during Ascended Astarion kisses.
I included a file with 3 more facial expressions that are used in AA kisses (2 sad ones and 1 pain)
Install BOTH this ^ file and [More_Stoic_Expressions] if you want all kiss animations used during his kisses to be changed, so your character will look unimpressed for the whole duration of the kiss.
It only changes the facial espressions during "kneeling" and "admiring the neck" kisses. 

Works with non-beefy male/female tieflings/humans/elves/drow/half-elves.
Now also has files for strong bodies and dragonborn.
If you'll need other faces/races/bodies to be added, let me know.

There's a new non-replacer version that changes only AA kiss-related facial expressions without editing any original animation files. 
Remove all previous files if you wanted to use it for AA kisses only
New file should work on all heads and races.
Incompatible with any mods that edit [Astarion_InParty2_Nested_PartneredWithAstarion.lsf]

For now it only changes the animations used in kneeling and "admiring the neck" kisses. "Bitey kiss" is a single .gr2 animation file that must be edited manually, so it may take a while to deal with it.
Use my other mod if you want happy facial expressions during AA kisses.
let me know if you'll encounter any issues

Huge thanks to moxifer3 for guiding me to the right direction and figuring out the files that contained facial expressions that are used during kisses ;D
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Installation/Uninstallation:

Install it like any other mod with mod manager of your choice.

This mod can be safely installed and uninstalled at any point.
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Check out my other mods:

Happy facial expressions for Ascended Astarion kisses
Run On All Fours (animation replacer)
Replace Volo's eye with hag's eye
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Mods used in screenshots:

Slutty Menswear 
Precious Pet Collars
Unique Tav Custom Appearance
Homebrew Face Tattoos
Replace Volo's eye with hag's eye
Solar - Body 2 Male Head Preset (used on the last screenshot)
Rolan's head with cambion ridges (replacer)