The creature seemed to turn its attention to Renamon as she spoke. A low, bubbling growl emanated from the cave opening as the slimy tentacles drew closer. The digimon's tail swung back and forth in building anticipation, her pussy already nearly dripping while the creature finally closed upon her.
The first tentacle positioned itself behind Renamon's swaying ass and suddenly, forcefully penetrated her wet pussy. A scream tore from her lips as she quickly pushed herself back against the creature's thrust, willing him deeper inside her.
"Aahn, yes, fuck me!" she cried, her tail's swinging being interrupted by a tentacle wrapping around it as another slid through her fur, over her stomach and between her breasts. Her nipples swelled quickly as she was caressed and fucked by the creature.
Rika watched her digimon call for her master, a flash of jealousy in her eyes as the creature began fucking Renamon. It was as if for some reason it simply wasn't interested in Rika at all. Even the tentacles along the walls seemed to be willfully ignorant of her presence.
Meanwhile, Renamon trembled and moaned, unaware of her trainer as well as anything else but the creature as lust once again overtook her mind. In a flurry of carnal pleasure, she reached out and took the tentacle wrapped around her tail, pulling it toward her mouth and engulfing it, sucking it greedily. As she pulled it, she forcibly lifted her own tail, exposing her butt to the monster. It added its own force, the tentacle tightening within her mouth, pulling her tail up and lifting her hips enough for a third tentacle to reach her bare ass, pressing against it and wiggling back and forth eagerly until her butthole finally parted and let it slip inside.
The digimon screamed against the slimy tentacle in her mouth as she was taken utterly. The digimon was completely helpless as her body stretched and shook to accommodate her master.
The human in the cave looked on, her face reddening as she watched her digimon get the treatment she'd been craving since days before. Rika lifted her ass in the air for the creature. With her cheek pressed to the ground, she watched from the floor as Renamon was fucked in her ass and pussy. She saw the digimon let her head back to take a third into her throat as yet more tentacles massaged her chest and squeezed her tits. The creature's slime already coated her entire body. She recalled the feeling of warmth and coziness, being covered in warm slime from her master as she was used. She wanted to feel that again.
Soon, Renamon was lifted into the air by the mass of fleshy tendrils, her body being thrust back and forth between the creature's plunging cocks. Her screams were muffled by the tentacle lodged deep within her throat, a combination of slime and saliva dripping from her lips.
A whine escaped Rika while she watched her companion being fucked relentlessly by the creature. She started to shiver, the cave floor being rather cold.
Saliva, slime and pussy dripped and pooled on the floor under the digimon and the writhing mass of tentacles. Her yellow fur was almost completely concealed by the creature as she reached what must have been her tenth climax of the day. A half an hour had passed before Renamon could scream openly again, the tentacle having vacated her throat.
Her throat felt empty, needy. Then, as if on cue, the tentacle swelled and shot warm cum all over her face and chest. She licked and slurped greedily at the mess while the others reached their peak as well. The creature squirted its seed deep inside the digimon's belly and womb. The others shot their load over her body, painting her with cum.
As the last of the cum leaked over Renamon's body, she was lowered to the floor, as with the last time. Rika stood, tears welling in her eyes as she approached her digimon.
"Rika," Renamon said softly from the ground, her voice hoarse. "I'm sorry."
The girl glared down at her digimon, the mixture of juices covering her as she lay in a puddle of cum and slime.
Rika looked up at the creature. "Why didn't you fuck me?!" she cried, indignant, "You had no trouble raping me, but now that I want it, you won't go near me!"
The bubbling sound echoed again from the far reaches of the cave, within the depths of the mass of tentacles that now covered the walls and ceiling. Warm slime dripped from the darkness onto Rika's head. She started, then whirled around as if looking for the creature's face.
"Why do you have to tease me like this?!" said Rika, thinly suppressing her wavering voice as she spoke. "I've been kneeling here forever, waiting for you to come and fuck me like you did to Renamon. Why won't you?"
She groaned in frustration as Renamon fingered herself, laying in the puddle at Rika's feet.
"Won't you please just fuck me?" the girl begged, "I've been waiting so long, I just want you to fuck me like you did before, I just want to serve you, please!"
The darkness gurgled and growled again, although it came in short bursts, like if a slug were able to chuckle.
Rika sighed and sank to her knees beside her used companion, softly splashing into the puddle. She ran a hand over Renamon's furry stomach, gathering up a handful of cum and bringing it to her mouth. Her tongue met the familiar taste of her master's semen. Her breathing slowed, and she delicately licked her fingers clean, swallowing the fluid and looking to Renamon again.
In her efforts, she didn't notice the movement behind her. A few tentacles wrapped themselves around Rika, gently lifting her into the air above Renamon. Another soon found its way to her ass. It quickly forced its way into her tight little ass.
Rika's body shook above Renamon, who was looking up into her eyes from the mess below. "Looks like that's what he wanted to hear," Renamon grinned, "You're cute when you beg."
"Ah!" The girl gave a sharp, loud moan as another stuffed itself deep into her pussy. Her back arched against the two cocks and she felt yet more wrapping around her body. The monster took hold of her arms and held her securely in its grip in the air.
One tentacle slid around her neck and curved back, positioning itself in front of her lips. Rika opened her mouth and relaxed her tongue, inviting the tentacle into her throat. It swiftly plunged inside, the head squeezing its way into her throat, making the girl gag against it.
Her body trembled and she screamed into the cock in her throat, her moans now the ones echoing off the cave walls and causing the other girl to look on with envy.
Renamon stretched below, then slowly picked herself up, the creature's fluid dripping from her body as she, for the first time, stood at eye level with her much shorter trainer. Rika's eyes were rolling back in her head. A thick, wet tentacle was fucking her throat, and her body was jerking back and forth while many meaty tendrils were pounding into her young body. The digimon took her trainer's face in her hands. The creature perceived this, and brought the girl in closer to her. The tentacle in Rika's mouth slid back just enough for Renamon to kiss her trainer deeply, the head of the appendage wedging itself between their lips as they kissed.
Rika moaned loudly into her digimon's mouth as the cock between them ejaculated. Renamon's tail was swaying back and forth again as they both shared the taste of their master's cum.
Soon, the rest of the tendrils followed suit. Rika was treated to that feeling she craved so badly, and screamed as the cocks lodged in her ass and pussy squirted thick, warm ropes of cum deep inside her. The ones wrapping around her burst as well, and soon Rika found herself bathing in a load of cum from her master. She moaned blissfully as she continued to kiss Renamon. As the creature released her dripping wet arms, she hugged her digimon, feeling how soaked her fur was as she held her tight, still suspended by the creature. Rika knew that if it set her down, her knees would not support her, so she was grateful.
They shared another long kiss. After a minute or two, Renamon pulled back, drawing the tip of one claw over Rika's tongue. "I-I have never kissed before, Rika," she confessed. Rika smiled wide.
Renamon began to lean in for another kiss when she gasped. She felt her swaying tail wrapped up by another tentacle, and she glanced up at Rika before another slid around her stomach. The creature yanked her with an oddly strong force off her feet and into the air by her tail and stomach, eliciting a scream of pain and surprise from her. Suddenly the digimon's exposed ass and pussy were crammed full of cock once more.
Rika blushed hotly as she watched the creature take Renamon again, then cried out as she felt her master plunging into her stretched pussy as well. "Ah! F-fill me with another load of your cum, master!" she screamed.
As they moaned and cried for more, the creature brought them in close, as it had done before. This time, there was no hesitation. Their lips mashed together eagerly in a rough kiss as they pressed their cum-soaked bodies together, both being stuffed full by their master as it wrapped its many tentacles around them, squeezing them against each other.
The digimon and her trainer were both and fucked mercilessly for hours. They eagerly took load after load of thick cum from the monster that dominated them.

When Rika was finally set down, it was upon the soggy body of her digimon, both engulfed in an inches-deep pool of warm slime and semen on the cave floor. They kissed and held each other as they slowly drifted off to sleep, their camping gear not even a memory to either of them.
It was fortunate they did not need their sleeping bags for warmth that night.