Stay and say that you want to offer your body

You stay and say that you want to offer your body.
They don't trust you and hold you with their strong hands... After speaking with an authority in the church, they agree that you kneel before the eldritch altar and if you offer your body, you can attract one of their gods.
They give you a red tunic and a text, and you must repeat it while looking at the altar.

They say that you attracted the attention of the multi-headed eldritch god. The air feels too hot as you offer your body, and your voice is trembling but you don't have any other option, maybe a portal will open or you can have a hint... but they are crazy.
Unfortunately, it's not a joke or a crazy tale... with a sudden pull, you are sucked into an astral dimension, the air is hot, and the god’s countless heads are looking at you.

You are confined within his dimension. You listen to multiple whispers in a language that you don't know, but you can understand something about an offering, and to penetrate your body.

Your body feels weightless and hot... your clitoris is hard as a rock, palpitating with an unnatural lust, with a trembling voice, you find yourself begging the god to fuck you, to use your body.
And your prayer is listened to, and with a huge reptilian cock the eldritch entity starts to fuck your pussy, in your dimension the size of the dick will tear you apart, and you will die, but here, the elasticity of your vagina is different, like a rubber doll the cock entered on your body and stretches your pussy. You feel full, and after a few minutes, you are ready to explode with an orgasm.

The entity observes you, as your cum loudly with his cock. His many faces groan, and you feel a hot cum inside your body.

Here, the seconds, the minutes, and the years are the same... you are lost forever, cumming and used like a sex doll for the eternity.
Sometimes you listen to the prayers of the nuns and you give them part of your pleasure to let them endure the hard existence, you become a legend among them, and you are maybe happy, but you never return to your world. This is...

THE END
Eldritch concubine ending