Kris slammed face first into the shallow pool at the bottom of the trap shaft. Kris popped free of the freezing cold water just in time to be splashed in the face as Ralsei dropped into the water a bit to the left. Kris shivered and quickly waded through the waters to a cold stone floor. His teeth were already chattering as Ralsei emerged from the water and made a beeline for Kris.

“Are you dweebs still alive!??” Susie called from the top of the slide lined shaft.


“We’re cold and wet and in a dungeon, but we are alive.” Kris called up to her before looking around for an exit. Spotting a grated off wall he sighed as he realized there wasn’t a building in sight before they had fallen into this trap.”... Go back and find that big tower, something tells me this is attached to that!”


“Awesome, I told you guys we should start there anyway.” Susie yelled back before stepping back and the shaft of light from the trap door slid closed.

“Well at least this area is well lit?” Ralsei observed attempting to wipe his glasses dry on his soaked robe before giving up. “Good night, it is cold in here…” the monster prince observed before doffing his robe and scarf in a quick motion. Kris frowned before imitating the monster cold as the air was his wet armor was even colder. “Feeling a little chilly?” Ralsei teased with a smirk as he pointed at Kris’ temporarily reduced member.

“Oh shut up you at least have fur!.” Kris replied curling up on himself rubbing his arms to force blood back into his fingers. He didn’t bother to cover himself as the goat had after all seen him naked more than once.

“Hmm yeah how about I share some with you? Snuggle up?” Ralsei said, crossing the small distance to Kris reaching out to Kris in a “gimme a hug” gesture. 


Kris leveled his best deadpan stare at the goat. “I only cuddle with my mom and cute girls and you aren’t either.”


Ralsei looked sad before a grin swept his muzzle. The goat-like monster hopped two steps backwards twirling in place. Kris blinked in confusion as the Darkner’s body changed. Before his very eyes Ralsie’s hips widened his sack and cock sucking up into his body leaving the unmistakable cleft of a pussy in their place. Ralsie’s shoulders narrowed as his chest welled up all at once into a pair of breasts, each globe nearly as big as the teen's head. “Ta da! What do you think, Kris? Am I a cute girl?” Ralsei teased with a wink and stuck out tongue.


“Wha since when could you do that?!” Kris yelled back ignoring the question initially. “You just do a pirouette and suddenly you're my hot sister?”


“Well it's a little more complex than- you just said I was hot!” Ralsei interrupted herself hopping forward to hug Kris who unprepared promptly fell on the floor. “Oof. well I think this is where we need to sit anyway… Give your sexy sister a nice kiss now.” Ralsei said before leaning down to kiss Kris.


Kris, if he had any objections to the situation, didn't voice them. Indeed the young man hesitated for only a moment before kissing Ralsei with all the passion he would embrace his mom with. It was not time at all after that Kris let his hands rove up and down Ralsei’s body, fingers sifting through soft fur to scrape ever so tenderly along the supple flesh beneath. Ralsei moaned as Kris’s palms caressed her nipples and he began to knead into her breasts. It wasn’t very long before she felt Kris’s cock stirring to life, the member rubbing along her thighs as it grew erect and coming to rest against her ass. Ralsei broke off the kiss shifting so that she was hovering over Kris not laying fully atop him.

“All warmed up bro?” Ralsei inquired softly, her tail twitching as she waited for his reply.

Kris smiled. “Good and hot sis. Let’s go for a ride!” Ralsei let out a bleat as Kris emphasized his point by giving her left ass cheek a good smack.


“Oh you are in for it!” Ralsei said as she reached beneath her to guide Kris’s cock to her pussy. She paused for a moment feeling the heat from his head resting against her lips before pushing her hips back letting his cock sink into her. Both teens moaned as Ralsei pushed herself onto Kris’s cock until she hit her limit. It was a new sensation for the both of them. Ralsei had never done this and so the idea of her pussy being stuffed full was not one she was prepared for. Likewise having only had sex with Toriel before Kris had never quite run into a girl that couldn’t handle all of his cock. Both adapted quickly though Ralsie figured that it didn’t matter how much of him made it in so she began to rock her hips back and forth and then side to side. She was experimenting with what made her feel best as much as what made Kris moan the loudest. Kris was hardly laying still and letting her do all the work, his hands roved squeezing her waist ass breasts and thighs. Kris wordlessly encouraged her to keep going by pushing her away or pulling her closer. He had to fight the urge to thrust up into her like he would with Toriel, instead lightly lifting his hips as she dropped back on to  his lap. As the two fucked with abandon Ralsei felt like she was able to take more of Kris’s cock. Whether it was her imagination or not the Darkener was getting closer and closer to her first orgasm. With a bleat of delight Ralsei rocked forward, to the pair's mutual frustration Kris’ cock slipped out of her just as he started cumming. Ralsei shuddered as echoing waves of raw delight ran through her whole being. Kris panted and moaned as his cock jumped and spat ropes of cum to the dungeon floor. The two exchanged a kiss once more.


“Okay bro, for round two how about  I...”  Ralsei stood up, turning the motion into a backflip. Kris watched as Ralsei returned to being prince once more. Her breasts deflated as her shoulders spread out once more. Likewise her hips narrowed as a sac and his cock emerged from the slit fully replacing it. “...change back and we do this the other way!”


Kris was lifted from the ground with a wave from Ralsei’s hand and the teen felt a tingle of alien delight creep up his spine. A felling of excitement at the thought of engaging in sexual acts from the opposite angle was cut off suddenly. Kris had always known for a while that he was a bit of a girly looking boy but today he was discovering the full extent of that. Kris’ shoulders barely shifted and his chest similarly showed barely any change. His hips pinched in just a touch as his balls and cock zipped up into his body leaving a  lovely pair of lips for her new pussy.


“Oh of fucking course!” Kris said with a groan looking at her body. “I would end up flatter than a pancake with no ass to speak of.”


“No worries sis.” Ralsei said with a smile and his eyes fixed on Lightner's groin. “If it really bothers you I can just plump you up a bi-” The dark prince was cut off as Kris placed her finger to his lips suddenly.


“I think Susie is getting close… Listen.” the Lightener said. Sure enough the distinct sound of violence and semi-displaced aggression was getting louder.


“Oh crap uh uh. Get dressed!” Ralsei said all  as he pulled his robe on once again and tied his scarf around his neck. Kris shivered as she pulled on the still damp armor, her last glove being pulled on just as the gated wall slid up into the ceiling to reveal  Susie twirling her ax.

“Got here in no time flat.” She boasted. Kris shook miserably as the cold plate and soaked cloth rubbed on newly sensitive areas. 

“Keep cool Sis.” Ralsei stage whispered to Kris who was already glaring from behind her bangs.

“I think I was keeping pretty calm, and don’t call me sis.” Susie said, turning and leading the group out of the dungeon.

“I’m telling mom about this one, bro.” Kris whispered back. She wondered if she was going to go home as her usual self or like this. If not for the uncomfortable clothes she’d enjoy this just fine, probably.