(Edited Version)
Sesshomaru dodged blows from Inuyasha with Kohaku still dangling by his neck from his claws. Inuyasha sent Kongo-soha, meido blades and tried flying at Sesshomaru with the dragon scaled Tetsusaiga. It was no use. The meido blades hacked into the side of the mountain destabilizing the cavern. The mountain shivered, it began crumbling. Inuyasha threw meido blades at Sesshomaru larger than before, closer together leaving Sesshomaru no choice but to drop Kohaku. He threw him against the wall of the cavern.
Sango caught Kohaku on Kirara's back. Kohaku hugged his sister gratefully. Miroku leapt over the balcony and joined them.
Sesshomaru looked around as the boulders began to fall from the top of the cave, "Rin!" He called. He closed his eyes and breathed deeply through her nose, he cursed, she has already left the cavern! Her scent was already trailing out of the cavern. He flew at the entrance as quickly as he could following Inuyasha who carried Kagome and Kirara who dodged boulders. They raced to escape before the cave collapsed on top of them. As soon as they were clear, Sesshomaru flew at Kohaku again, "meido zangetzha!" Inuyasha yelled, the meido blocked his path.
"This doesn't concern you Inuyasha!" Sesshomaru bellowed. He removed raised Bakusaiga in the air.
"It does if you intend to take Kohaku's life," Inuyasha growled stepping in front of Kohaku, "get out of here kid."
Kohaku nodded half falling over to move backwards.
"The snake said she was defiled. What did you to do with her!" Sesshomaru attacked Inuyasha full force. Inuyasha dodged to the left, then the right, flipped over and tried to kick Sesshomaru in the face.
"Gee I wonder who defiled Rin!" Inuyasha yelled at Sesshomaru, "maybe someone else," he raised his eyes at his brother. He pulled his sheath out to block a flood of green energy from Bakusaiga.
"Sango, take Kohaku, quickly," Kagome called. "O-ni-sama please listen to reason!" She kept her distance knowing she was no match for Sesshomaru.
"Kagome stay back!" Inuyasha yelled, "Sesshomaru, you son of bitch stop!" He blocked another blow from his brother's sword over his head.
"MOOOOOOO," all eyes went to the sky. A cloud formed, as an old man rode a cow in the air.
"Totosai?" Sesshomaru was distracted for only a moment, before he lashed out at Inuyasha again for blocking his way.
"Really you can't think of anyone who touched her in that way Sesshomaru? No one!" He swung at Sesshomaru's head.
The blade was easily deflected. Sesshomaru growled in frustration.
"Don't," Inuyasha swung at him, "make," he tried to kick his brother in the face, "me say it," he sent another meido straight at Sesshomaru, "in front of everyone! Full moon! You remember that? Huh, you want to know what she told me? When I comforted her after she got into a huge fight with Kohaku? Should I tell everyone?" His voice was so low only Sesshomaru could hear it.
Sesshomaru stopped, he lowered his sword, Inuyasha was right. That night, he had touched Rin in her most intimate of places, he had let himself explore her body, the tips of her breasts, the clefts of her wet crevices. Something inside of him was screaming at him to complete what he had started, he shook it out. She can't…I can't…
"You have no idea what you did that night do you? The pain you caused?" Inuyasha breathed deeply, "Kohaku was going to propose. Then he saw you feeling her up!"
Sesshomaru punched Inuyasha in the face.
"Now you get it," Inuyasha grumbled pulling himself off the ground. "Put that damn sword away. You ever attack me like that again and I'll cut both your arms off."
Totosai landed, the cow mooed again, "oi, where is Rin-chan? I felt her sword finally awaken."
"That sword was amazing," Kagome said. "Why did it sleep for so long Totosai-jiji? She's had it for five years, it could never do that before."
Sesshomaru was still fuming, but then something hit him, his back was on fire, it felt like he couldn't breathe. There was a hint of fear mixed into it as well. He nearly buckled when the next wave of pain spread over his shoulders. He was uninjured, it took him a moment to understand, he flew at Totosai and grabbed him by the throat, "why? It's her pain isn't it?" His back felt like it was flaming.
Totosai inhaled deeply, his cheeks puffed out, as fire flew from his mouth aimed right at Sesshomaru. "Hey, stay off me, or I won't explain." Totosai sat backed up behind Inuyasha, "where is Rin?"
"Towards the east," Sesshomaru said instinctively but he didn't understand why. He could smell the injuries from the battle, but something else tugged on him. It was a sense that he hadn't had before.
"So, it worked," Totosai stroked his beard, "you seem surprised Sesshomaru. When you came to me, you asked for a sword that was infused with jewels from your father's grave and made from one of your own fangs. You hoped it could provide protection to a human. I knew it was Rin, what other human has been responsible for changing you from a heartless yokai to the great Dai-Yokai you are today? You would never have mastered Tenseiga or regenerated your arm without her. But why did she need protection? You left her with warriors, you left her with a group of people who helped destroy Naraku and the Shikon No Tama, was there really a need for what you asked? So, the sword sealed itself, until the day that you would no longer see her as a child and she would no longer rely on you for help. That day was today. Today you fought as equals."
Sesshomaru was still furious, the fire still burned in his back, a pain not his own. She was hurt badly, "why can I feel her pain?"
"Why can you Sesshomaru?" Totosai scratched his head and motioned Sesshomaru towards him, "closer."
"I want no closer to your filth," Sesshomaru responded.
The rest were dumbfounded listening to Totosai. Totosai motioned Sesshomaru again.
Sesshomaru rolled his eyes. He stalked a few inches from Totosai's face. "You didn't happen to share a piece of yourself with Rin, did you?" The wrinkled old man asked.
My blood, I used it to seal her wound.
"Do you have strong feelings towards her Sesshomaru-sama? Love perhaps?" Totosai's eyes seemed to bulge further out of his head than they had before.
Sesshomaru released Dokkasu at Totosai.
"Ahhh, Inuyasha, teach him a lesson!" Totosai yelled as he jumped backwards.
"I think he just learned one on his own," Inuyasha snorted staring at his brother. He was the one that had comforted Rin after the incident by the full moon. He was the one that had held her while she cried. He knew that Sesshomaru felt more for Rin than he had in the past, he knew that Sesshomaru was fighting his own feelings instead of accepting them.
"You waste my time," Sesshomaru immediately flew away with Jaken below screaming about being left behind..
"Oi where have you been Jaken?" Inuyasha asked. "Totosai, did you know that the sword would make Sesshomaru fall in love with Rin?"
"What? He's in love with her?" Totosai scratched his head again, "I don't think even I could have predicted that. It makes sense though. As long as they continued to grow apart, Sesshomaru's heart hardened. This was happening because he was using his anger to mask his true feelings towards Rin…something changed almost a year ago, the sword was ready to awaken, it only took Rin to know that she could defend herself without Sesshomaru by her side, making her no longer a child that needed protecting."
"But his Yoki is strong, how can she manage it?" Kagome asked.
"Oh that, it was a baby fang, he got it from his mother. If he had used one of his fangs now, the sword would kill her." Totosai laughed.