To the folks who hate AA with all their passion and who can't wait to leave a hateful comments about AA: i made this mod for myself and my fellow AA fans who disliked the scared facial expressions during kisses. If you dislike the mod or disagree with me, then look away. No one's forcing you to use it, let the others enjoy it.
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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:

Major update: Now there's a version that changes only the kiss-related expressions without replacing any original animation files, so no more smiling in inappropriate times, yay!

Feel free to remove any previous files (unless you want to play as a smiley pcycho) 
New main file should work on all heads and races

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.

New version is incompatible with any mods that edit [Astarion_InParty2_Nested_PartneredWithAstarion.lsf]
let me know if you'll encounter any issues

Use my other mod if you want more neutral facial expressions during AA kisses.

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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Different vesrions:

• There's now a new version that includes all changes from Nightingale's Lord Astarion - Ascended Astarion Alternative Romance while keeping smiley facial expressions during default AA kisses. 
  

It won't be compatible with any other mods that edit following files:
[Astarion_InParty2_Nested_PartneredWithAstarion.lsf]
[Astarion_InParty2_Nested_PartneredWithAstarion.lsj]
[Astarion_InParty2_Nested_PartneredWithAstarion_Scene.lsf]
[Astarion_InParty2_Nested_PartneredWithAstarion_Scene.lsx]
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• Now there's another version of original mod with facial expressions edited by maldon555.
  

maldon555 volunteered to help and experiment and edited the facial expressions during "kneeling" kiss, so now Tav/Durge looks rather smug (check this link to see how the kiss looks like). This version also makes your character look a bit surprised when AA suddenly stops during "looking at neck" kiss

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Info for replacers (optional files):

So, I figured out which facial expressions were used during AA kisses and swapped all scared, sad and pained ones that were used in the kisses to happy facial expressions. 
Yeah, you've heard it right, for now it's just a replacer that swaps the original facial expressions to happy ones, so your Tav/Durge may express themselves a bit weirdly during other cutscenes. It can also affect npcs that use the default/vanilla faces available to you in the character creator.

That's it until i figure out how to edit only kiss-related files without touching the original animations. If you know if there's a file that contains a list of animations that are used during the kiss, let me know, and i'll try editing it, so we can have a version that won't alter original animation files.

For now it changes animation files of facial expressions for default and possibly modded faces of male/female elves/tieflings/humans. Should also work on drow and half-elves.
Now it also has a version for dagonborn and half-orcs.
Let me know if it works on modded faces properly.
For now it only changes the animations used in kneeling and "admiring the neck" kisses. 

There's also a version that works on female gith heads, but it needs a bit more testing. Let me know if it works/doesn't work or if it affects companion Lae'zel's facial expressions.

If you want any other races animations to be added, let me know and i'll try to make it work.
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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:

More stoic facial expressions (replacer)
Run On All Fours (animation replacer)
Replace Volo's eye with hag's eye
Less Smiley Tav and Durge
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Mods used in screenshots:

Rolan's head with cambion ridges (replacer)
Slutty Menswear 
Precious Pet Collars
Delfinition's Armors 
Unique Tav Custom Appearance
Homebrew Face Tattoos
Replace Volo's eye with hag's eye