Any character you recognized is not mine, alas. No money exchanged hands, and no copyright/trademark infringement is intended.
The Goa'uld ran through the Colorado woods, its host panting and gasping for breath.
The thrice-accursed SGC had discovered Enki and brought it to the Tauri base for questioning. It had escaped, but its host was shot as they entered the dense pine forest. It could never heal the injury and escape. It must find a new host, and quickly.
It burst through the woods onto one of the primitive dirt roads that criss-crossed the forest. It's sudden appearance startled a young man who was kneeling by a ground vehicle. He arose, one hand still gripping the tire iron. He looked at the Goa'uld warily.
"Can I help you?" he asked.
"Yes, yes, please help me," the Goa'uld said. "Please help, they are after me..." He staggered towards the youth. Hmm, he had a patch over one eye. Well, he didn't have to keep this host - just long enough to find the nearest large city and find a more suitable host.
The Goa'uld's host chose that moment to die. The body collapsed at the young man's feet. The young man leaned over the body, and Enki burst out of the dead host and launched itself right into the startled Tauri's mouth. It ignored its new host's scream as it burrowed towards the spinal column.
It ran into some opposition as it established control over the new host. As so often happened, the host tried to create a guardian in its mind-scape. This host was slightly different, in that two figures appeared - a solider of the Tauri and a snarling, ugly creature. Enki conquered them after a very short struggle. There was no time for gloating, he must have the host finish the repairs on the vehicle and leave the area before the SGC could surround the area.
To Enki's surprise, the host would not move. He tried to apply pain, but was thwarted. He gathered his will to push the host harder when a voice echoed in the mind-scape.
"You will not harm my manservant," it stated with aristocratic arrogance.
A Tauri male appeared in the mind-scape, tall and thin and pale. It looked on Enki with cool disdain.
"Leave," snarled Enki. "I am a god; you can not win."
"No. I have prior claim on this human. You will leave at once." the stranger stated with calm assurance.
Enki was puzzled. "What are you? You are not Goa'uld, you are not Tokra."
"I do not expect a glorified tapeworm such as yourself to understand," said the man. "I tolerate the Soldier and the Hyena. They give my servant strength. You, on the other hand," he said, and for a moment his eyes flashed gold and red, "are an interloper, and will leave immediately. Begone."
Enki could feel his hold on the human slip away. His host started gagging, and Enki felt himself ejected onto the gravel road.
He heard a voice yell, "There it is!". Enki felt the pain of a zat blast, and knew no more.
SG1 looked at the young man in amazement as he rolled over and staggered to his feet.
"This is unprecedented," stated Teal'c. "For a Tauri to be able to eject a symbiote on his own..."
"Had help," muttered Xander Harris. Being surrounded by the military was bad. But you know what was really bad? Knowing that the next time he visited the castle, he would have to say, "Thank you, Master"" to Dracula. What could be more galling?
I've seen a few different takes on this idea - either the soldier and the hyena combining forces to toss out the parasite, or an anti-possession spell created by Willow ejects the Goa'uld - but I've haven't seen Xander's tie to Dracula used in this way before.
Oh, and poor, poor Goa'uld. No time to gloat!