How to improve the mouth opening for Blowjobs?

[Nymra]

The normal way of just "opening the mouth" for blowjobs in SexLab animations is ok, but not satisfying. Especially when the cocks get too big. 

 

Is there any way or any mod or mini-mod that changes the facial expressions to a more classic blow job face with a wide mouth opening? Or is their a way or a guide to change this manually within sexlab facial expressions?

 

The main issue I have with it is, that the mouth opens, but the lips do not open as wide as they could. In other words, currently the models make an "o" for blowjobs, while they should make an "O". 

I m missing the right words in english to explain this. 

 

TLDR: is there a way to make the characters mouths open wider when playing SexLab blow job animations?