You might wanna watch Leonard Nimoy singing "The Ballad of Bilbo Baggins" on Youtube first. You understand the story without watching it, but it's fun to watch.

I added something to the chapter. More are to follow.

"Damnit, Jim! Where did you get us stranded now?" McCoy asked.
"I don't know. All I know is that the planet beneath us is inhabited by various humanoid species and none of them is industrialized." Jim answered but then turned to his science officer: "Spock, do you have a safe spot to beam a landing party to?"
"Yes, I have found a safe location outside a forest. We should, however, dress according to the local dress code," Spock answered.
"What about those ears of his? We can't explain them," McCoy muttered under his breath.
"The captain found an explanation once before. I am sure he can find one again," Spock answered and gave Jim a knowing look.
"Stop it, you two. Just call me when you are ready. I'm going down with you. Knowing you two you'll get in danger and I'll have to fix you back up."
He didn't give Jim any time to argue with him. Jim ordered Scotty to the bridge to take care of things while he was on the planet. He didn't have to ask if Spock would be coming with him. On some missions there was no way he could persuade him to stay behind and this was one of them. So he didn't even try. A small part of him, which he refused to listen to as yet, was happy that he had Spock by his side. They materialized on a field of grass just outside a dark looking forest. Nobody was near but Jim's instincts told him to be careful. Luckily there was a path leading into the forest and after looking towards Spock he decided to go down that path. The farther they went into the forest the darker it got. But neither Jim nor Spock were frightened by darkness. They just became cautious.
"Maybe we should rest for the night. It's getting too dark to see anything," Jim suggested.
"Yes, Captain. But I would advise that someone stays awake. We do not know this world and therefore we don't know anything about its inhabitants," Spock answered.
"Am I right in guessing that you are the one who wants to stay awake?" Jim asked, smiling. He already knew what Spock was going to answer.
"I am Vulcan..."
"... and therefore need less sleep than humans. I know. But maybe you should let the security guards do their job for once." Jim finished his sentence.
McCoy rolled his eyes. This had been happening more and more over the last few weeks. Jim and Spock were so to each other that they seemed to know what the other was thinking. That was what made them the best command team in the fleet. But he was sure there was more. Much more. He just wasn't sure that Jim and Spock knew that. They had an understanding of each other that went beyond normal friendship. But he sure as hell wouldn't tell them in the middle of a forest on a foreign world where they couldn't feel safe. At least that's what he thought.
Sometime in the night they heard a noise. Jim was almost immediately awake, walking to Spock who had already his tricorder in his hand and was checking their surroundings.
"What is it?" Jim asked.
"I am not sure. There are non humanoid life forms nearby. We should go see what is happening."
Jim nodded and went to the rest of the landing party to wake them up. He didn't want them to split up until he knew what was happening. Too many disastrous outcomes to several missions on unknown planets with people of his crew dead had taught him that.
Spock eyed him. He would have found it better to take only two people to investigate, because the chances of being seen were smaller but he knew why the captain acted the way he did, and didn't say anything.
After a short time the landing party came close to the sound and what they saw wasn't reassuring. Huge spiders were everywhere, and they appeared to have victims in the trees. They were agitated but none of them could figure out why. And Spock's tricorder registered one life form that couldn't be seen.
Before anyone could do anything one victim fell to the ground and was unwrapped by a small figure. The two of them hurried to save the others. Spock counted that there were thirteen of the small figures. Spock could see one small figure urging the others to run away but for some unknown reason the figure didn't really succeed.
They lost the group of very strange beings and continued their walk through the forest. Nothing worth mentioning happened until they came to a palace with yet another indigenous species acting a little agitated. Spock and Jim hid in the bushes and moved their way to the gate to see and hear what was going on. What they heard was that this new species had taken captive the group they themselves had seen earlier on their trip. They went onto the pathway and were soon stopped by one of the guards.
"Halt! What is a man doing in your company? Where are you from? I have never seen you in this forest before."
"I am from another region and have travelled far. I must have lost my way," Spock answered.
"Very well. The king will know what to do with you. But the man can't go in. Only elves are allowed inside. Come with me."
"I am afraid that is not possible. I have something to discuss with your king," Jim objected.
"I'm sure your friend can do that, too. You must understand that this place is dangerous and therefore we can't let anyone in unless he is one of our kin," came the answer. Jim wanted to say more but Spock interrupted him: "His logic is sound. We ourselves have seen the spiders."
Spock exchanged a look with Jim who nodded. He still didn't like the idea but this would be the easiest way to get to know the ways on this strange planet. Spock had still his communicator after all.
After Jim watched Spock go into the palace he went back to the landing party who were waiting a little way off.
"Did you get to know anything?" McCoy asked.
"No. But Spock just got invited into the palace. They seem to think he's one of them. And humans aren't allowed in," Jim answered.
"That's gotta be a first! This is the first planet we've come across where someone thinks Spock is actually one of them. But he can take care of himself. You know that." That bloody hobgoblin better get back alive. McCoy thought. He knew that Jim wouldn't be himself if something happened to Spock.