Note: It's the exact same plot but I changed Ariel's sisters’ names. XD
In R'lyeh, I'm in my human form and naked. Lying on a silk bed, I enter my finger gently into my pussy while Cthulhu watches me.
I am Ariel. I'm his toy. He loves to watch me masturbate. I touch my G-spot with my finger. I moan louder and louder. I come. Cthulhu is happy.
He approaches me and uses his tentacles to clean the outside of my vagina. I yell with pleasure, then Cthulhu tells me telepathically that he has a nice surprise for me. He speaks to me in the R'Lyehian language, but I can understand him.
I follow him and he leads me into a kind of dungeon. Chained to a wall are six women and I recognize them despite their metamorphoses. These are my sisters. Caspia, Indira, Karina, Mala, Perla and Tamika. They have a kind of ball in their mouths, which prevents them from speaking.
Cthulhu tells me mentally that my sisters came to R'lyeh to "save me," even though I'm happy with him. Soon we will be reunited. First, he has to make love to them, so they'll stay by his side for eternity. I smile. What a wonderful surprise!
Cthulhu starts with Perla. He gently enters a finger into her pussy and uses another finger to squeeze her clit. Perla struggles. She lets out a muffled scream. Cthulhu squeezes her G-spot repeatedly, penetrating her several times with his finger. Perla cum and no longer struggles. Cthulhu enters his penis into her vagina, rams her several times and ejaculates. Perla belongs to him now.
He frees her and continues with Tamika. Perla joins me and we watch Cthulhu make love to Tamika. As with Perla, he enters her pussy with his finger, makes her cum, then ejaculates inside her with his cock. Tamika is now his too.
Cthulhu frees Tamika and goes on to make love with my other sisters. Mala, Karina, Caspia and he finishes with Indira. Cthulhu did the same thing with each of my sisters. He fingered her pussy, got her wet, made the mermaid-turned-human cum, then penetrated her with his penis to ejaculate inside her.
Now all my sisters are free and by my side. I am happy. We all belong to Cthulhu and our bodies will please him for life.
I ask him if he wants to enter his cock inside me and he agrees. Cthulhu penetrates my pussy and I scream with pleasure. I can't wait for him to give me his seed.