This is cool!
The longer I look at this the more interesting the story gets. There is no slickness or disturbance on the ground suggesting the tentacles approached her, her belly is quite full and round, one tentacle is entirely on her and is entirely on or in her.
This suggests to me she hiked out here with a belly full of tentacles, and now the tentacles are finally coming out to play.
She's worked hard to make this happen and I hope she and they have fun.
Her mouth shaping feels odd. It looks like her upper lip is doing much more stretching and shaping than her lower lip to open wide enough for what's passing though her mouth.
In the very VERY beginning there are a few frames where physics seem to take a moment to catch up and her breasts, top, and left pant leg suddenly shift and change the way they lay.
I like the way she's holding onto a tentacle with each hand. Like she's making sure they don't fall off, or make her lose her balance while helping upper one get out faster to clear her airway.
It seems like she would be a bit sweatier from the physical demands of hiking and getting tentacles out through her throat, but I have no idea how difficult or even possible making her look sweatier would be with models and program you used to create this.
I could easily see trying to get her hair to lay on her skin like her skin is wet being a nightmare.
Thank you for making and sharing this.