Hmm not a very common request xd
I actually dont pay attention to this when female characters do blowjobs/facefucks/deepthroats in games.
For me the angle is more important than anything.
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Bound by Lust (by LustSeeker)
This is probably the game you are looking for. It pretty much has what you want, which is girls with no experiance having a gag reflex while sucking dick.
One of the girls works for the princiapl undercover as a prostitute. You know she dresses like a hoe and if a dude agrees to pay money for sex, she reports them to the principal to be expelled. She could end up sucking a dude in the bathroom stalls (you as the MC have the option to prevent this from happening and she would be happy for it, or you can keep quite and let it happen). And she is not rly a whore, so she is very bad at sucking dick so the dude loses patience with her and starts face fucking her and the gag reflex is there. The animation, facial expression and sound matches exactly for what you are looking for.
Sadly this is the NTR content of the game
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Glassix (by Gaweb Studio)
This game has what you are looking for, many girls actually dont know what they are doing but sadly its just described in text because the game has no animations or sound for the sex scenes.
So if you are fine with just text describing that the girls are gagging and chocking on the MC's dick, then I recommend this one.
A word of warning the game is huge and has a lot of women. Obviously you wont catch a married woman or a slut gagging in the game. So go for the virgin girls in the game.
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iNSight of You (by AdventAnyx)
I played this some months ago but droped it due to the bad camera angles. And abuse towards one of the female characters.
But I remember a blowjob scene with the boss girl. You call her in the office and tell her to suck your dick (a few hours in).
I dont remember if she had experiance with sucking dick tho...
But she was bad at it , so MC decided to punish her and force his dick deeper. She gagged hard and was struggling.
I think this game will have what you are looking for.
Sadly this boss girl is going to go through slut traning and be used. You will see what im talking about once you play it.
She will not be only for the MC, she will have to fuck others sadly.
Thats all I can think right now. These games stand out when Im thinking of a gag reflex.
I honestly dont pay attention to this xd
Id prefer the girls be willing to suck but Ill take what I can get.
Bound by Lust and iNSight of You , the girls are NOT willing to suck dick... sorry
The other problem here is that many games do not have sound.