"So what first, smart one?"
Gaster reached his left hand out for the smaller's right and gently curled his fingers around the human flesh-like substance, letting his attention focus on the sensation before it was promptly ripped away from him.
"Don't touch me!"
"We have to be connected in order to combine power," he explained, finishing off by holding out his hand for Chara to grab. They had all the time in the world to do this; no need to rush things.
With a small growl, the child-like ghost reluctantly reached out their hand to grab hold of, their rosy red cheeks increasing in color. "Fine. Let's just get this over with."
Gaster thought about warning them what would happen when they walked through (or more the fact that he didn't know what would happen), but his hand had been taken much quicker than he'd thought, and he'd rather not rip it away so suddenly. Chara might not give theirs back.
Shortly afterward, two lights emerged from the two creatures- one, a red heart leaping from the shorter's chest, the second forming inside the hole in Gaster's free hand, hovering out of it in a spherical white shape.
How peculiar, Gaster thought, the ball beginning to take the shape of a hand that made its way over toward Chara's heart. Surprisingly, neither Chara nor the heart made any move away from it, however the former was staring rather intently, their reddish-brown eyes wide and fixated on the light hand as it gently curled its fingers around the heart. All of a sudden, the two began to glow and merged together, the hand appearing much like Gaster's, only, instead of a hole in the middle, there was Chara's heart to fill it.
The point at which Chara and Gaster were connected- their hands- began to meld together while all this took place. The latter had taken a quick glance later on in the process and raised what would have been his eyebrow had he had any, but the former didn't seem to be paying any mind, so he decided not to make a big deal out of it.
Once the hand-heart combo had finished forming, it faced its palmed toward the door and stopped. Well this was...interesting. What on Earth were they to do now? Gaster turned toward his companion to see if they knew and noticed that their eyes had narrowed, all focus seemingly directed at the door. The heart began to glow within a few seconds. He then blinked as he felt a sudden warmth emit from the inside of the hand, which somehow felt as though it could be controlled just as fluidly as either of his two current hands. The more time had passed, the brighter the heart became, the warmer it felt until finally it started to become just a bit too uncomfortable for Gaster to keep hold of.
Something told him to release the warmth, and he did, directly at the door. A bright red light pulsated from the center of the hand toward the door, generating a force so powerful that the two beings had been pushed back just a few inches. Both brought up their free arm to shield their eyes from the light and, when it had passed, looked to the door that had received most of the impact.
It was dented.
Gaster watched as his partner's facial expression gained a slight smirk and immediately felt the hand begin to heat up again. Without even thinking, he allowed another blast to channel through it and yet another indent became present on the door, however there was not so much time to examine it this turn as Chara prepared yet another blast, then another, then another, smirk increasing further to a grin with each hit.
Eventually Gaster had began to feel uncomfortable with how eager Chara was becoming at demolishing the door. He wished to perhaps hold back a bit, however when that was attempted, Chara's smile dropped and they simply increased the amount of heat that was being produced until, at some point, it was much too hot to keep hold of and Gaster had no choice but to release the last two or three blasts that would rip the metal off its hinges, causing the slab to disintegrate completely.
The child-looking ghost violently tugged their arm away from Gaster's, causing a small yelp to come from the latter and a smaller crack to form in the hand-heart combo. Gaster frowned, attempting to explain with one hand that ripping apart so suddenly would likely lead to negative side effects, but it was a difficult message to convey when half of your voice was taken, so he could only watch as Chara yet again pulled at the joint, making this time another, larger crack in the heart-hand. The taller of the two made a last-ditch effort to prepare himself to be broken away, though unfortunately was not quick enough. With one last pull, they broke apart, the heart-hand splitting in two down the middle. Both Chara and Gaster began to emit a light the same color as the part that they had let loose earlier, only this time their bodies swirled into a ball of energy that pushed itself each into one of the halves.
For a moment, all stood still. Neither of the two had any clue what should be done next. The left side- the one Chara had been drawn into- was first to charge through the barrier, the right, Gaster's, taking a moment to breath before quickly following after.
Just gonna put this out there- commenting "MOAR" or whatever isn't helping improve my writing, give me inspiration, or help motivate me. It's just the slightest bit annoying.