(Art not mine, it belongs to it's rightful owner)
Guys I know dat Over!Sans is waaaay older than Over!Frisk, but in dis story, their ages are the followin':
Sans: 20    Frisk: 18
Okay! On with the story!

Frisk's POV:
I'm 18 now, an' I finally saved the magical humans from the legends.  I'm curently thinkin' of how ta fight for equal rights for humans, bein' the am'baa'ssador an' all.  Oh-my, inflenced by Sans, I guess. I chuckled ta myself.  While I'm thinkin' I strolled though the park.  Ahh, nothin' beats a late night stroll, am I right?  Suddenly I heard rustlin' noises behind me, but just as I was 'bout ta look behind me when two guys pinned me on the ground.
"Hey!  Let me go!  Mmph!" They covered my mouth ta keep me from speakin'.
"A lowly monster who freed the humans aren't worth savin' or livin'." A deep voise said while kickin' me an' scratchin' me with claws.
"Mmm!  Mmm!" I tried ta break free.
"Huh!  Interesin', a goat tryin' ta break free from two big cats." Another voice said while the per- er, 'big cat', kickin' me in the stomach.
Oh-no, I'm waaaay too weak ta get away from these guys.  What will become of me.........  Oh how I wish Sans was here...............
"Hey!  What do ya think yer doin'?!"
Sans?!  H-how did he know I was here?!  Was he.......stalkin' me?!

Sans' POV:
It is late, but I just can't sleep.  I can't help but think that somethin'.....bad is gonna happen.  Uurgh, y'know what, I'm gonna get a cup of milk.
I crawled outta bed an' went ta get some milk, as I walked outta ma room I saw Frisk walkin' outta the house.
Why is she up?  It's pretty damn late fer a midnight stroll.  Also the idea of goin' out fer a stroll without company at midnight, fer a monster who freed us humans, it's not the 'brightest' idea.  What if the haters get ta 'er?  Well, guess I gotta follow 'er then, after I finish this cup of milk.  Can't let this milk go ta waste.
Finishin' ma milk, I went ta look fer 'er, she can't have went far.  Ok, I might have taken awhile 'cause I also wanted a midnight snack, but still. Then I saw a tuff of goat fur on the pavement, must be 'ers.
She must have came ta 'er favorite park again, well, then it must not be too hard ta find 'er.
Then, I saw 'er.
Two guys, or rather a lion an' a tiger monster is beatin' 'er up.  How dare they!!!  Hurtin' ma little shee-, I-I mean the am'baa'ssador, like that?!?!
"Hey!  What do ya think yer doin'?!"
"Oh look, yer favorite human came to save ya, pathetic." I clenched ma teeth, did he just insult ma favorite monster?!?!  Oh ho ho, he's gonna be sooooo boned.
I made a bone wall an' grabbed Frisk's SOUL, turnin' it blue, an' put 'er behind the wall, away from the haters.  The two got angry an' started ta fight me.
"Whelp, here goes.
It's a beautiful night outside,
crickets are chirpin',
echo flowers are glowin'......
On nights like this haters like you......
S H O U L D  B E  M I N D I N '  Y E R  O W N  B U I S N E S S."
I made a few bones appear as they prepared weapons of their own, an' the fight begins......
Time skip~ sponsered by TEmMiE'S TeM FlAkS
At long last I finally gotta hold of their SOULs an' threw 'em inta two different bone cages.  Then, I immediately went over ta Frisk ta see if she's alright.
"Frisk!  Ya alright?  Where'd they hurt cha?" I asked, since with all the blood coverin' 'er I can't really see where exactly are the wounds
"I-I think th-they cl-claw-ed open my a-arms, a-an' my s-stom-ach hurts, t-too.  S-sans, it h-hurts, it hurts so baaaad."
"Shhhh~ Save yer breath, I'll get ya ta Al ta fix ya up." Seein' that she's hurtin' too bad, it's probably not wise ta teleport, last thin' I need is 'er gettin' too dizzy while bein' hurt an' pass out.  I scooped 'er inta ma arms an' carried 'er bridal style.
"Saaaans I c-can w-w-walk myseeeeelf." D'aaaaaw she's so cute like this, whinin' an' all flushed up.  Though, I'm not gonna let 'er go anytime soon........
"Too late, I'm carryin' ya there."
"Saaaaans!" Heh, cute.

Frisk's POV:
Sans carried me all the way ta Alphys' place.  An' of course I pouted all the way, but he just gave me that signature warm smile, makin' me blush while poutin'.  I rang the doorbell, since he can't while carryin' me.  Alphys opened the door, an' upon seein' ma condition, she was shocked.  Is it really that bad?
"W-what h-h-happened?" I was 'bout ta answer when Sans spoke.
"She got beaten up an' clawed by good fer nothin' haters."
"O-oh gosh, s-set h-er th-there, o-on that b-bed." Alphys cleaned up the the wounds on ma arms an' applied medicine then wrapped it up.  I winced a little, but Sans calmed me by holdin' ma hand gently.
"Y-you're qui-te l-lucky, th-there's o-only some m-m-minor c-cuts a-and b-bruises."
"Th-thanks Al, an' you too Sans."
"Ya, thanks Al.  Common, let's go home." He says as he scoops me inta 'is arms, carryin'' me bridal style again.
"Saaaaaans, I can waaaaalk.  Stooop iiiiit." I whined.
"Not a chance, sweets."
"Saaaaaaaans!"
"Heh."
I never win at this, he just won't let me go.  So, I was carried back ta the fontbros' house.
Time skippe~ brought ta ya by lazy author~chan
We got back ta the house an' he set me on the couch an' looked into ma eyes with a ,surprisin'ly hot, serious look.
"Now, tell me, what happened?" I told him everythin' an' started ta cry, why can't monsters see that humans are nice?
"Hey, hey, shhh~ I understand sweetie.  Calm down, everythin' is alright now.  I'm not gonna let 'em get cha."
"I-I'm fightin' for your r-rights.  I-I'm *sniff* d-d-determined to do it!"
"I know, I know.  Shhhh~ ya dun need ta cry sweetie, everythin' will be alright." He hugged ma shakin' figure, an' I hugged back tightly, needin' the confort he's offerin'.

Sans' POV:
That night I decided that I am gonna protect ma sweet little Frisk.  I became 'er bodyguard, followin' 'er every step, well, except some private places of course.  Some monsters think that us humans were locked in the underground 'cause wer're criminals, an' 'cause Frisk released us, she was said that she was a criminal too.  They are wrong, ma sweet little sheep would never, an' I repeat never hurt a single SOUL.  I cared fer 'er every day, Paps was especially happy 'cause of this, since he said 'I'M PROUD THAT YOU ARE NOT SLACKING OFF.'  Months passed by an' I'm slowly but surely fallin' fer 'er.  I had a hunch ever since I saw 'er, but one can't always trust yer instincts.  Yet now, ma instincts were proven ta be true.  I........love 'er, but I wonder....... Does she feel the same?

Frisk's POV:
Sans has gotten sooooo overprotective, even more than mo- I mean Toriel, but I kinda.........like that?  The fightin' fer human rights was tough, but in the end I did it, monsters an' humans finally has equal rights.  Though somethin' has changed durin' the past few months, I'm startin' ta feel......weird around Sans, ma SOUL pulses faster an' I could feel ma cheeks gettin' hot.  Can it be?  Can I be............fallin' fer him?  He's just so nice ta me an' sweet, carin', an' he is quite hot........ Wait, what?! *sigh* I guess I am in love with him.  But, does he feel the same?

Both's POV:
I can be too sure....... But fer now, it's a love secret.
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Heya, soooo, I got a loooong break, an' I think I can upload these more often.  But fer y'all who wants ta see Crushtale, ma other story, I'm deeply sorry.  I have some chappies in ma hand written script, but I have gotten writer's block in the middle of the story, I won't change the story, but it's gonna take awhile ta continue it.  I will type the chappies that I have tho, but maybe after these oneshots that I have writtened are finished.  That's all!  Bye guys, till next time.

Meow out~