As you touch the the black book, a sudden darkness envelops the whole place. The green glow creates a pentagram on the floor, and a huge dark-green slime oozes from it, the creature opens multiple yellow eyes.

Before you can move, vine-like tentacles wrap around your body forcing you to spread your legs.

Exposed and helpless, the vines easily rip off your clothes revealing your vulnerable intimate hole, each desperate attempt to grab the tentacles is futile, and your hands slide over the slippery surface. A vine opens like a banana, revealing a meaty pink section, like a thick tongue. Humiliated, you feel how it pokes your ass, massage your testicles and the slime, like a powerful drug, forces you to have a painful but hard erection.

The inevitable happens, your ass is penetrated by the creature, deep and hard. Your screams sound inside the library. The more you struggle, the harder it fuck you. You can watch how the thick tentacle enters and exits your ass without mercy.
You notice how another vine-tentacle opens like a flower, revealing multiple small tendrils, they massage your penis and you start to drool, instead of screaming, you are moaning like a whore, this is degrading and painful at the same time.

After almost an hour of hard fucking, you stop struggling, you ejaculate, and you feel weak, the pentagram starts to glow again, and you and the slime and banished to another dimension. This was the most humiliating and painful orgasm that you ever experienced.

In the pages of the black book, it's described how the slime continues to fuck you, and the creature learns how to make you cum by preserving its energy and only using your ass... your story will continue for many, many years, but you never returned to your world, this is...

THE END
Anal dimensional slime ending

Task: Tie your legs and spread them. Poke your ass with a well-lubed medium dildo for 1 minute, and rub your testicles. Act humiliated struggle, and try to resist the penetration. Insert the dildo, deep and hard in your ass, and fuck you for 5 minutes. Moan in pain, use small dildos or a rubber glove to gently massage your cock. After 5 more minutes, cum and act degraded.