After being killed by Frisk, you became trapped in the void with Geno. He hated you and was suspicious at first, but you soon grew on him, and he basically adopted you as his child.

Right now, you were in Geno's lap as he held you close as if you were his lifeline. It's understandable since you are the only one who's with him. He's already grown so attached to you. He didn't want you to ever leave, though that's not a problem since you literally can't leave the void.