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Chapter 34: A Hidden Cave

The Sun, the Moon, and All Our Stars

Summary and Details…

Chapter Background and Summary: Sebastian and Kate are on an adventurous camping trip in the Scottish Highlands. Their first two days were leisurely, but now that their third day has begun, they're getting higher into the mountains and closer to the places they want to explore. In this chapter, the two lovers discover a cave hidden behind a large waterfall that does not appear on any map.

Pairing: 25-year-old, post-Azkaban Sebastian Sallow x Kate Mayflower (my OC)

Content warnings: In general, this story is rated 18+, so MNDI. For this particular chapter, there are no content warnings.

The full chapter is available below the cut; it can also be found on AO3 (link is posted below). Please leave some feedback. A comment, like, or Kudos would be quite motivational. 🥰

Chapter 34: A Hidden Cave

Sitting on a large rock, Sebastian unfolds his map. As she patiently waits, Kate observes her boyfriend silently studying the route.

Being dressed for action and adventure feels so foreign to her. She had to pay a visit to Augustus Hill at Gladrags prior to the trip to acquire outfits suited to hiking and exploration per Sebastian’s strong suggestion. She could still hear his words in her head: “Dresses are completely unsuitable for the trip.” Trousers are not Kate’s favorite clothing item by any means, but she had to admit, now that they were truly trekking up mountains over rocky terrain, that they are the most sensible. Accompanied by boots, a sweater with two additional layers, gloves, and a cape, Kate wears a darker color palette than usual - browns with varying degrees of gray.

Sebastian appears dashing and completely in his element, clad in a jacket and trousers in off-white, with a vest and cape in dark green, and boots, a necktie, and belt in shades of brown. His chocolate eyes are trained on the map, then glance at their current surroundings.

“We should still have a couple more hours until we reach the first cave,” he explains, perplexed. “There is nothing like this marked on the map. It’s strange.”

Kate, though surprised, can’t help but marvel at the gorgeous waterfall along their path. “Then it’s a lovely surprise, wouldn’t you say?”

Sebastian’s eyes narrow as he stands up, examining the waterfall. “It is rather pretty, but this map should account for almost everything we should see along the way. The thing is - we are going in the right direction… I just can’t make sense of it.”

Kate reaches out, smiling and putting her hands over his, forcing him to fold up the map. “Do we need an explanation for something so beautiful? Perhaps we should simply enjoy it as it is.”

Sebastian sighs, the tension visibly disappearing from his posture. “I suppose you’re right.”

He pockets the map, then puts an arm around Kate’s waist as they both admire the sight. She leans her head between his arm and chest, taking in every little detail.

A moment later, she gasps. “Sebastian… look! Look behind the waterfall! Do you see it?”

Sebastian focuses, staring. There is a tiny path leading towards the waterfall, which doesn’t seem all that interesting until he notices an opening - a cave entrance - behind it. “Was that there the entire time? I swear, I didn’t notice it until just now. How odd.”

“I don’t know,” Kate replies honestly. “Likewise. I only just saw it…”

They turn to look at each other, rather intrigued.

“Sebastian, if this was not on the map, it could mean that no one knows this is here,” she deduces.

“Yes, you’re right,” Sebastian agrees, intrigued. “Who knows what could be inside? Perhaps we are the first to find it in centuries…”

Kate raises her eyebrows. “There would only be one way to find out… Should we go inside?”

Sebastian pauses, running through hypothetical situations they might find themselves in. “Unmarked destinations can pose danger. If no one has been here for years and years, there could be a high reward if someone used it as a hiding place for treasure. But, I’ll admit - situations like this are high-risk.”

Kate nods. “I know nothing about this, but I trust your judgment, Bash.”

“High risk, high reward…” he muses, then puts his hands on Kate’s shoulders, making certain that she is listening to him carefully. “There could be traps. Curses. Spiders. I mean, truly, who knows.” He studies her face. “My love, I don’t want you to take this the wrong way, but I’m not sure you’re ready for something like this. This is only your first time exploring…”

She cuts him off. “But you said that the castle we’ll explore has been abandoned for centuries, too. Why is that any different?”

Sebastian considers her reasoning. “I… I understand what you’re thinking. It’s just that caves have a more… wild and untamed nature than something man-made like a castle. Anything could be waiting in the dark for us.”

Kate smiles, pulling out her wand. “Then let’s use Lumos.” She pokes him with the wand. “My moon, this is why we’re out here, isn’t it? To have an adventure together? Come on, let’s check it out. If you’re with me, I know I’m safe.”

The worry on his face begins to fade. “Yes, that’s true… Well, if you’re this enthusiastic, I suppose we could have a look around.” He takes her hand, kissing it, then speaks in a serious tone. “Just promise me… if I tell you to do something, you’ll do it.”

“You’re not the boss of me, Sebastian Sallow,” she playfully retorts, already beginning to wander onto the narrow path that leads to the cave.

“Kate - wait! You need to be more careful. It’ll be slippery,” he warns.

Just as he finishes speaking, she loses her footing with a little shriek. She almost topples over but catches herself in time. It all happens so quickly that Sebastian can do little more than reach out. She flattens herself against the rocky wall, her eyes wide as she stares at the steep drop leading to a pool of water far, far below. Her heartbeat drums in her ears.

“Are you okay?!” Sebastian asks, gingerly making his way towards her.

“Yes,” she responds breathlessly.

“This is exactly what I meant when I said you need to listen to me,” he continued, his own heart rate speeding. “Merlin, you scared me.”

“I’m sorry.” She observes him carefully. “I know you have more experience. I guess I was just excited to try something new.”

“It’s fine. It’s fine,” Sebastian repeats. “Come here.”

Kate shuffles back towards him, much more cautious now. Her boyfriend opens his arms and takes her into his embrace.

“I don’t want to have any chance of losing you,” he whispers, kissing the top of her head.

“You won’t. I promise - you won’t.”

“I’ll protect you as best I can,” he murmurs against her hair. “My sun.”

“And I’ll do the same,” Kate tells him. “I’ll protect you, too, my moon.”

Sebastian laughs heartily. “Oh, Kate, my love. I don’t think I’m in any need of that. Remember, I’m the experienced one here.”

She smiles. “Yes, you are. But even so…” Glancing back towards the cave, she asks, “Are you sure we should do this? I’m having some doubts now.”

“It will be fine,” he answers after a moment. “We will be fine.”

As the light slowly disappears behind them, Kate holds on to Sebastian’s arm. His eyes dart around, trying to get a sense of what the cave might be like. She can’t explain it, but she feels a sense of exhilaration along with a sense of dread. Every step forward, the sensation increases. Neither of them speak. The two listen intently for any sounds that might indicate danger, but it is eerily silent and has been since they entered the cave, despite the rushing waterfall outside.

Without warning, both of them fall over, tripping over something that feels like overgrown tree roots. Kate squeaks in surprise and then becomes more alarmed as she feels tendrils moving around her, wrapping around her legs and torso. She is separated from Sebastian, who is dragged in the opposite direction.

“Bash!” Kate shrieks, terrified as she is carried towards a wall, the tendrils growing tighter as she squirms.

“Lumos!” Sebastian bellows with his wand outstretched, bathing the area in light.

Kate gasps in realization the moment she sees the source. “Devil’s snare!”

“Lumos maxima!” he calls out.

The plant drops him immediately, shrinking away from the illumination. Sebastian stands up quickly, rushing over to Kate with his wand held out towards the Devil’s Snare. It relaxes its grip around her until she is able to stand on her own two feet.

She reaches out for him, trying to feel secure with a hug, but he shakes his head. “We need to move past this area - it’s not safe.”

Sebastian pulls her forward with haste, turning back to see the Devil’s Snare stretching back out across the cave floor as the light from his wand gets further and further away.

“I should have known it was Devil’s Snare,” Kate whispers, shaking her head in remorse. “My papa would have been so disappointed to see me scrambling like that. I… I didn’t have a clear head.”

“It’s alright. Just keep your wits about you,” Sebastian requests. “We may run into more surprises soon enough.”

After walking about ten more minutes, Sebastian affirms Kate’s feelings by sharing his own. “Something about this cave is strange. I don’t like it. I have half a mind to turn back. It just doesn’t feel right.”

“I have an odd feeling, too. It’s like I feel… thrilled… but also terrified.”

“Maybe we should leave-”

“Sebastian!” Kate shouts, cutting him off. “Wow! Do you see?!”

He squints and then his eyes land upon what his girlfriend has spotted. From right where they stand, the cave walls are suddenly growing with life - and glowing. Lined with green vines and leaves along with huge, exotic flowers, it seems like a little paradise within the darkness. The area is lit up by bioluminescent mushrooms. Common blue butterflies flit about, not at all afraid of the humans walking amongst them.

“I don’t understand… I didn’t think anything like this could grow without sunlight,” Kate muses, astonished. She reaches out to touch a yellow and pink hibiscus flower, her fingertips caressing the silky, soft petals. Her eyebrows raise when she realizes that all of the plant life feels as cold as ice, yet unfrozen. “My papa would be fascinated.”

“No, none of it could grow without light,” Sebastian replies. “This makes no sense.”

“But it is real, Bash,” Kate tells him, astonished. “Touch something. You’ll see. It isn’t an illusion…”

He reaches out to touch leaves on the vines, sharply inhaling when he feels how freezing cold they are. His eyes are wide as he contemplates how the cave could defy nature. He takes a moment to think.

“Something’s wrong here,” Sebastian finally concludes in a serious and urgent tone. “We need to leave. It isn’t right. It isn’t natural.”

A group of butterflies rushes in front of Kate. She gasps. “Sebastian, even more butterflies!”

They fly further into the cave with Kate eagerly following. Sebastian trails after her. “Kate…” he warns.

She completely ignores him, transfixed by the display. Deeper and deeper she travels, driven by the instinct to follow the butterflies to beautiful treasure, just like she had in the forest. As nervous as Sebastian feels, his feet move forward. Something within him is bidding him to continue on, to follow his lover…

The path within the cave eventually ends, circling around a lowered pit. The butterflies flutter down below, where Kate and Sebastian cannot follow.

From the corner of Kate’s eye, something dark flies, almost hovering up above. Not able to see much in the darkness, she ignores it, figuring it must be a bat. It certainly isn’t the butterflies; now at the bottom of the pit, they all fly in a wild circle, stuck in an endless loop, until they disappear into thin air.

The pit dimly lights up. They are no longer observing a dark and empty pit but a bookstore within the cave.

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