When the bell finally rang the students were already packing and getting up, ready to leave before Professor Alphys was even done talking.
"And, uh, I know you're all excited for the weekend, b-but don't forget about your, um, g-group projects. Y-Y-You don't have to make th-the whole thing in one weekend, just, um… Just stay in touch with your partner, o-ok?"
Susie, one of the two students who hadn't moved an inch since the bell rang, fought back a chuckle – oh, she was going to stay in touch with her partner, alright.
"S-So, uh… S-Su-Susie?"
"Hm?" The mauve monster turned her head to look at the reindeer girl standing next to her desk, avoiding eye contact and nervously twiddling her thumbs with a slight blush on her cheeks; Susie recognized her as the class nerd, but couldn't for the life of her remember the shy monster's name. "What?"
"I-I, uh… I was wondering… Well, if… Are… Are you…"
Due to her bangs covering her eyes, the girl was unable to see Susie rolling her eyes; quiet people may have pissed her off in the past, but awkward people took forever to form a sentence, which thoroughly annoyed her – if Susie didn't have plans, she would have simply said "cool, whatever" and walked off. But she did have plans, so she was forced to endure it.
"A-Are you doing something this weekend? Y-Y-You and Kris, I mean, n-not just you. I-I noticed the two of you have, um, grown close lately, so I-I-I thought m-maybe we could all h-hang out. All three of us! Together!"
Susie gave the human sitting in front of her a side glance – just like her, they were still on their desk, waiting for the classroom to be emptied. The human who also preferred to keep most of their features concealed under a faceful of hair smirked; she knew what the human named Kris was thinking, and while she had to agree she wasn't completely against the idea, she barely knew the reindeer girl. She wasn't sure if she would actually join them in their "after-school activities" or just freak out and tattle on them, and she sure as hell wasn't going to risk it unless the odds were in her favor – in her eyes, 50/50 wasn't worth gambling.
"Yes, actually." She replied in her deep, gruff voice that wouldn't seem right coming from any other monster girl. "We have to work on that dumb project Alphys told us to do. I'd rather make it at the last minute, but Kris keeps telling me that if we finish early we'll have more free time later on, so if it'll get them to shut up about it, then fine."
"O-Oh, um… Th-That's ok then… M-Maybe next weekend?"
"Um, Kris? Susie? Noelle?" The reptile girl blinked when the teacher called them by name; so THAT'S what the shy girl was called. "Aren't you going home?"
"Y-Yes, I… I-I'm going, Miss Alphys!" Noelle rushed to her desk to pick up her bag and courteously bowed in front of the teacher before exiting the classroom. Susie rested her feet on her desk as she watched Kris explain to the teacher that they would stay a little longer to discuss the group project. Alphys nodded.
"O-Okay, then. Stay as long as you want, just, um… Turn off the lights when you leave, ok? A-And if you catch someone trying to steal the chalk, then… Don't let them?"
Kris stood by the teacher's desk, watching as she gathered her things before leaving the classroom. Susie chuckled while the teacher scrambled to pick up her things as fast as she could, clearly uncomfortable being alone in a room with the two biggest troublemakers in Hometown.
Kris approached the door and looked through the glass. Once they were sure the coast was clear they gave Susie a thumbs-up. With a smile on her face, the monster girl got up and walked towards Alphys' desk, where she promptly took a seat and kicked off her old sneakers. Kris walked towards her and asked whose turn was it.
"Yeah, like you don't remember! You know very well that it's my turn, so get to work."
Kris laughed, not at all bothered by the fact that their attempt to trick Susie into servicing them twice in a row had failed, pushed her down onto the desk. They climbed on top of the taller lizard woman and kissed her while running their hand through her unkempt hair. Despite being the one that was being serviced, Susie didn't want Kris to show her up, so she wrapped her strong arms around the human's torso and used her tongue to fight for dominance over theirs. She eventually won when Kris stopped fighting back and allowed her to explore every inch of their mouth.
"You know how to work that tongue, except when we're kissing." She pointed out. "Sometimes I think you're doing it on purpose." Kris grinned – they weren't confirming nor denying anything.
The human helped their monster lover take off her jacket, followed by her white shirt. When they did that for the first time, Kris was surprised to find out that Susie wasn't fond of wearing bras (and a little disappointed, given that they had spent the best part of an hour the night prior with Asriel's pillow and their mother's bra, using them as a training dummy to figure out the most efficient way to take them off from the front without looking like a complete amateur). Once they got used to the sight, Kris was positively giddy; Susie's breasts were big enough so that they could stuff both nipples in their mouth with ease. Their first attempt had been a little subpar, but they had gained plenty of experience since then. Plenty!
Susie suppressed a moan when she felt the warm touch of Kris' tongue on her left nipple while they kneaded her right breast. She gently rubbed their back with one hand while caressing their long, silky hair with the other. Kris soon switched, proceeding to lick her right nipple while massaging her left breast. Once she had been properly warmed up, Kris popped both nipples in their mouth and started sucking, which they knew she loved as much as they did, if not more. That proved to be too much to handle and Susie let out that moan she was trying so hard to hold back.
She absentmindedly started moving her hips, attempting to rub her crotch against their flat midriff, an act that didn't went unnoticed by the amber-skinned human; they stopped tending to her breasts, which caused her to whine in protest. Displaying strength that one wouldn't expect from someone their size, Kris lifted both her legs with ease and placed them on their shoulders. Susie smirked when she realized what was about to happen and simply crossed her arms behind her head, ready for what was coming.
The human didn't waste any time, immediately unbuttoning her jeans and taking them off before tossing them over their shoulder. The discarded pants collided against the motivational quotes hanging from the wall, bringing some of them down with it, but that was the last of Kris' worries: right now they were focused on the moist lips inches away from their face and the patch of hair above it – unlike with bras, Susie actually used to wear panties before she and Kris started semi-dating, but after losing more than a few pairs when they had to get dressed in a hurry, she stopped wearing them in the morning – after all, in just a couple of hours either Kris or herself would take them off again anyways, so why bother?
Kris started by rubbing the tip of their nose against her engorged clit and licking around her pussy, but not actually touching it. Susie bit her lip.
"Stop being such a little tease and get to work, freak!"
Kris shivered – originally, calling them "freak" was supposed to be an insult, but over time Susie started calling them "a freak in bed", so what once started as an insult evolved as a codeword; she called them "freak" when they were doing a good job, and that brought them joy. With a smile on their face, Kris planted their mouth on Susie's vagina and proceeded to suck and lick while rubbing her inner thighs.
"Oh, yes, now we're talking~!" Susie could still form coherent sentences because Kris was taking easy, but once they picked up the pace her dialogue was reduced to moans, gasps and unfinished sentences that were constantly interrupted by more moans and gasps.
"Y-Yes, Kris! Right there, you.l.. Ahn~! You're really… Oh god~!"
"I-I'm sorry, I forgot my-" Kris and Susie both looked at the now open door, where a dumbfounded Noelle stood, not sure how to process what she was looking at. "…my… pen… cil…"
"'Sup?" Susie greeted.
Noelle looked at Susie's upside down face; she was blushing and drooling, but smiling. She shifted her gaze to Kris who, too, was looking at her with a smile on their face – their wet lips had a saliva string connecting them to-
"N-N-NEVERMIND!" Blushing heavily, Noelle slammed the door closed and ran down the hallway.
The human and the monster girl looked at each other, then after a second or two of silence, they laughed.
"You think she's gonna rat on us?"
Kris shrugged; they told the naked girl beneath them that Noelle was a goody two-shoes, so her running off to tell Alphys was very likely.
"Then, should we…?" She sadly eyed her discarded shirt resting on the floor.
Kris shook their head and explained that any teacher would believe Noelle over them, even if they made themselves presentable; since they knew she was going to pull the trigger, why not get expelled for putting on a REALLY good show? After all, it seemed like a waste to get expelled just for having a little fun.
Susie chuckled. "Using my own words against me, huh? Ok, I see how it is!" She pulled Kris by the collar of their shirt, forcing them to lie down on top of her. She licked her own juices coating her human's lips before pulling them into a deep, passionate kiss. "If we're going down today, then we're going down with a bang."
Kris laughed at the double entendre and wrapped their arms around Susie as they went in for another kiss. The monster girl proceeded to remove Kris' pants mid-kiss, but the human grabbed her hand, stopping her from finishing what she started; they told Susie that she had given them a mind-blowing orgasm during their last session, when she was the one servicing them, so it was only fair for them to return the favor.
"Well, since you're offering…" Susie gave them one last quick kiss before wrapping her arms around Kris and turning around. With her then on top, she kneeled over Kris' head and started rubbing her pussy against their face. "You don't have permission to stop until I cum, freak!"
Kris did a mock-salute before wrapping their arms around Susie's thick thighs and shoving their tongue in as deep as they could.
"Yeees~!"
They kept going for a couple of hours; eventually the desk became too small for the positions they were attempting and the teen couple had to move to the floor. Kris eventually gave in to their partner's demands and was quickly stripped naked.
Much later, the nude human and monster were lying on top of a pile of clothes, drenched in sweat and other bodily fluids, panting heavily. It was only when Susie glanced towards the window and realized the sun was already setting that they noticed they hadn't been interrupted. She chuckled.
"Either 'Susie and Kris are having sex on your desk' sounded too hardcore for even Alphys to believe, or the nerd just ran off."
Kris agreed, before their ringing cellphone caught their attention. The human dug through the clothes until they found their pants, the cellphone inside one of their pockets. When they answered, Susie wasn't surprised to know it was their mom; after all, Toriel was a very overprotective mother and their child hadn't gone home, even though classes were over hours ago. They came up with a weak excuse about how they had lost track of time while working on a school project, and apparently their mom bought it.
She was caught by surprise when Kris explained that they still needed to discuss a few more things and asked Toriel if it was ok for her friend to come over for dinner and maybe even stay the night.
"That sounds wonderful, Kris! Of course your friend is welcome to spend the night; a sleepover seems like fun, and I'd love to meet them."
Kris turned around and smiled at her once they ended the call; that naughty smile made it clear that they wouldn't spend the night talking about the school project. She smiled back at them and, once they were done getting dressed, they left school walking side by side. Susie raised an eyebrow when Kris grabbed her hand, but the usually expressionless human looked so uncharacteristically happy (and they looked so pretty when they smiled) that she was going to allow the public display of affection just this once.