Here's a wip fic based on this where Spider befriends a curious little Symbiote and tries to navigate through life being the host to an alien parasite.
"You are restless," Tshaheyl's voice curled through his mind, an amused hum laced with concern. Spider exhaled through his nose. "Yeah, well, can you blame me?" he muttered, weaving between the thick tree roots. "You make me look like a lunatic."
Tshaheyl giggled, the sound vibrating through his skull like a pleased purr. "I do no such thing. You talk to me. They do not hear me. It is not my fault you have a weak excuse for subtlety, Little Spider."
Spider scowled. "Don't Little Spider me," he grumbled, reaching a clearing bathed in soft bioluminescent light. He crouched beside a stream, cupping water in his hands to peer into his reflection. The coolness was a relief against the heat of his frustration and annoyance.
Tshaheyl’s presence curled around him like an affectionate shadow, tendrils of warmth pulsing through his chest like a warm blanket. She was inside him, a part of him, and that meant she felt everything he did. The mental exhaustion. The frustration. The loneliness that had settled in his bones long before she arrived.
"You are worried about them," she mused, her tone shifting into something softer. "These...Sullys. You worry they will fear you."
Spider let out a slow breath, watching the water ripple beneath his reflection. "They're suspicious," he admitted. "Lo'ak especially. I think he caught me talking to you earlier, and Kiri's been staring at me."
Tshaheyl was quiet for a moment before replying, "You do not trust them? You will not tell them about me? You gave me a name and a home, and still you will not tell them. Why is that, Little Spider?"
Spider frowned, rubbing a hand through his hair. "It’s not about trust. It’s about safety. If they knew about you, they'd freak out. Neytiri would—" He stopped himself, jaw tightening. He didn’t want to think about her reaction. Neytiri barely tolerated him as it was. If she found out he was bonded to some strange, sentient parasite that thrived off consuming living things, she’d probably kill him on the spot.