SoulBonds

On her final run Frisk swore to Sans on her determination that she wouldn't reset. Fourteen years passed since that promise, and much has happened. Chara has been silent ever since then, giving Frisk some peace of mind. Frisk and Sans had long since grown closer over their awareness of the resets. Over the course of time they have come to know of the burdens they carry from the past timelines and can comfort the other accordingly. For Sans, it's the nightmares of erasing and timelines filled with death and waking up back in the Underground. Frisk grounds him with a kiss and reminds him of her swear on determination. For Frisk, it's having Chara in her soul, the memories of them having total control of her body over the course of their few hundred Genocide runs, and dealing with PTSD from the multiple deaths by her friends and family. Sans puts her at ease by checking her stats and pulls her out of shock with gentle touches and loving kisses. Not long ago they 'tied the knot' and got 'hitched'
("heh." "SANS! STOP PLAGUING AUTHOR'S SUMMARY WITH CONVENIENTLY PLACED PUNS!" {Hey come on Paps, it's all cool. See you're smiling.} "I AM AND I HATE IT!").
Now join them at their honeymoon and see what the future holds in store for all of them.

{Greetings viewers, I see you've found my story. Now I know what you're thinking, so before you come at me with your torches and pitchforks, let me explain... I KNOW Chara and Frisk are non-binary/androgynous but for the sake of my story they aren't. Don't get me wrong I'm cool with them being either gender or not. But AGAIN for the sake of my story they both will be girls. And sadly there will not be any romantic Charisk only platonic sibling-ship. After all you could say they've both been through 'hell' and back. Ayyyeee! (o ͡° ▽ ͡°o)}