So I will put here some stories about Tenten and Neji fall in love with each other. At the start they are just friends. Naruto is still in the village so they have 13 years old.
First one:
"Hurry up Neji! We're going to be late for training!" Tenten said to Neji almost running on the road.
"Tenten, even if we run 'till there we won't make it in time."
"Then let's take a short cut."
"What short cut?"
"I know let's go through Akagahara (Akagahara is a training ground from Naruto OVA 1)"
"But, Tenten, Akagahara is forbidden."
"Are you scared?"
"Scared!? Of course I'm not."
"Then let's go!" saying that Tenten started to run and Neji went after her.
(After 10 minutes)
"See? We're almost there and we didn't fall in any trap." Tenten said while running.
They stop near a river to drink some water, but the ground started to move and a huge hole opened under their feet. They fall in. The hole's ceiling appeared again.
"Where are we?" Tenten asked. "Everything happened so suddenly that I didn't see."
"We felt in a trap." Neji said.
"Here is so dark. Can you see something with your Byakugan?"
"We're in a hole, but the walls and the ceiling are too resistant to go throw them."
"Then what should we do?"
"Wait."
"Wait for what?"
"For someone to take us out of here."
"Ok."
(After a lot of hours)
"I think is already dark." Tenten said with a sleepy voice.
"Yeah." Neji said.
(Next morning)
"Hurry up Naruto, we must find them!"
"But Sakura-chan I'm still sleepy."
"Come on Naruto-kun, use the power of youth!"
"Ok, ok."
"The only part that we didn't examine is the Akagahara forest."
"Naruto, Lee-san, let's go there."
Sakura, Lee and Naruto arrived in Akagahara.
"Look here." Sakura said. "This trap was activated not long time ago."
"How do we open it then?" Naruto asked.
"From here." Lee said and pull a handle.
The trap's ceiling was opening and they saw in there Tenten and Neji, they were both sleeping.
"Wait a second!" Naruto said.
"What's the problem, Naruto?"
"Why are they holding their hands?"
"You idiot!" Sakura said. "In situation like this people hold hands to don't fell alone. There was completely dark so maybe they hold hand to fell more safety."
"But I don't see Neji needed to fell safety." Naruto said.
"Neji no, but Tenten yes." Lee said. "Besides he could see with hid byakugan, she couldn't."