Explain and offer yourself

His tail coils around your waist, dragging you against his scaled belly, and then he pins you on the ground "Very well. You will serve until I grow bored."
You are his now, you think that this was a bad idea.

On all fours, he mounts you from behind, his massive bulk pressing you into the stone with possessive heat.
The dragon's huge cock pokes your ass, and his hot tip pokes your rear entrance with pressure, not enough to breach, just enough to make you tremble... He's playing with you. You moan in pain and you try to beg him, but he finally pushes the tip of his cock inside. The stretch is terrible, you scream in pain, and when you try to move away, you feel your body weak, is not responding to you... your body fights to resist, but he doesn't stop. Inch by inch, he forces his way deeper, you feel your guts pressing your lungs, you can't breathe normally, the pain makes you feel dazed and you are going to faint...

Your screams sound inside the cavern, when you are too weak, he impales your ass with his cock, reaching too deep, and at this moment, you collapse.
He casts healing magic and you immediately wake up, dying in pain. "Not so fast little one, you forget about the knot"
What? he's not serious, this is a nightmare.

His thrusts are merciless, forcing his swollen knot harder against your entrance, stretching you far beyond your limits, it's hot, painful, **** you scream. The moment it pops inside, a searing, molten heat floods inside your belly. His semen is filling you scorching your insides. Your belly distends like a balloon, the skin stretches, and your insides are burning. You feel that you are going to faint from the shock multiple times, but you can't... he doesn't let you.

Suddenly, the pain vanishes. You smile as the darkness swallows you whole.

You are discarded outside the cave, years later some explorers discover a strange stone, with the shape of a stretched human bowels.

Bad ending
Melted brain ending