Note: It's the same plot but I changed the names of Ariel's sisters. XD
I'm Ariel. Me and my sisters Caspia, Indira, Karina, Mala, Perla and Tamika live in R'lyeh with our beloved Cthulhu. We are eternally human. Although we miss our mermaid tails, it's a small price to pay for all the sex Cthulhu gives us. We belong to him and we're happy.
Today, he introduces us to his daughter, Cthylla. Cthylla wants sex, just like her father, and we're more than happy to help them.
Cthulhu and Cthylla can extend their tentacles over long distances, so they use them to penetrate all our holes. I've got a tentacle from Cthulhu in my mouth, one from his daughter in my pussy, another from Cthylla in my ass. Caspia, Indira, Karina, Mala, Perla and Tamika also have tentacles playing with their breasts. The tentacles squeeze them gently.
Our bodies fill with pleasure. My sisters and I squirm. We let out muffled moans. Soon Caspia, Indira, Karina, Mala, Perla, Tamika and I are cumming. The tentacles shoot a warm, white liquid, like sperm, into us.
Cthulhu and Cthylla free us from their tentacles. They're going to play with my body. My breasts are massaged by Cthulhu, my buttocks by his daughter. Cthulhu enters his cock into my asshole and pumps until he gives me seeds. Cthylla sticks a finger in my pussy and squeezes my G-spot until I cum a second time. I scream, I moan, I orgasm with happiness.
Then Cthulhu and Cthylla will play with my sisters. They start with Caspia, then Indira, Karina, Mala, Perla and finally Tamika. They did the same as with me. Cthulhu penetrated their asses. Cthylla fingered their pussies. My sisters orgasmed in turn.
After they've finished, Cthylla says goodbye and leaves. Cthulhu orders us to go and rest. We obey. We get into our silk beds and fall fast asleep.