Undertale AU Sibling Oneshots

Cross x Older Brother! Reader

Requested by the lovely TortaDePoyo!~

You let Cross weep into your shoulder as you held each other. Your eyes were shut tight, too afraid to open them and see the white void around you both.
"...You can't OVERWRITE it, can you? Chara can't either?"
"Neither of us can..." He murmured, pulling back from your embrace to give himself room to breathe, even if he didn't have the lungs.
You finally let your eyes open, tears beginning to form as you looked down at him. You reached out, swiping your thumb across the scar on his cheek, wiping away the tears that fell over it.
You both were like that for days, just sitting in each other's company in this blank space.
That is, until Ink came.
You weren't too trusting of him at first, nor was Cross. But Ink eventually got to you both, keeping you both company, bringing you food(you'd usually let Cross have the bigger portion), and even telling you both about the multiverse.
"You mean... You protect and help other worlds?"
"Exactly!" Ink replied, giving you a grin. "I go around and keep this guy named Error from destroying exist—"
"That means you can help our world right!?" Cross cut him off, hope and excitement in his eyes.
You joined in with a big grin. "You can make it like it was before!"
Ink seemed thrown off by your ecstatic emotions, but replied with a sorrowful look.
"I-I'm sorry, this world no longer exists, so I can't do anything."
You and Cross both looked devastatingly crushed, the hope and light fading away.
"I'm sorry... I really wish I could do more..."

You and Cross had watched Ink leave, any hope of being free of this white madness now completely gone.
Eventually, you weren't sure how much time had passed, another skeleton came.
This one called himself Nightmare.
He promised you both a way to rebuild your home, and after a bit of convincing, Cross agreed.
"Are you sure about this Cross?" You asked softly after having tugged your brother to the side.
"You don't see another way, do you?"
"I don't but... are we sure we can trust him? What if..."
You left the words hanging in the air.
"I'll protect you then." Cross stared you in the eye, determined as he placed a hand over your upper arm.
In one of the many timelines you and Cross were forced through, you had been quiet literally sliced in half trying to protect Cross from an attack, and while that timeline is long gone and partially forgotten, you could sometimes feel the split moment of pain.
"...Okay. Let's see what his plan is." You gave Cross a small smile, letting him lead you go back to Nightmare.
You had protected Cross time and time again, getting hurt and dying multiple times over. Now it was his turn to protect you.