Peter waited until Gamora was out of his line of vision to completely lose his shit. His head was pounding, his body was aching, and he felt almost as drained of energy as he did whilst being used as a human battery. Deciding, or rather hoping that it was only the delayed after-effects of the traumatic events a few days prior, he attempted to calm himself. Deep down, however, he knew that this was not the case. That dream felt too real, and the pain felt too raw.
It was then that a pitter-patter outside his door brought him out of his train of thought, back into reality. The source of the noise, a miniature humanoid tree, entered his bedroom, bearing gifts. Extending his arms, or branches rather, he handed Peter a glass of water, then pulled himself onto the bed next to his, currently much larger, Terran friend.
Peter graciously took the water, and practically finished off the glass in one gulp (granted, Groot had dumped out half of it on his journey down the hall). He felt the cool liquid travel down his burning throat, cherishing the closest thing to comfort he could feel at the moment. He set the glass down, and put on a mask of painlessness for the small plant.
"Thanks buddy, that's the first pleasant thing I've had since waking up." He said, with fake cheerfulness.
"I am Groot."
"Not you too," Peter groaned, "I am completely fine, a-ok. Just a dream, no damage done." He claimed.
"I am Groot"
"Yes, I'm sure I'll be ok."
"I am Groot."
"Sleep sounds great right now." He lied. "You should probably go find Gamora." He suggested, for no other reason than to get the tree-tot (though he loved the thing) away from him.
"I am Groot." Cried the little twig as he scurried down the hallway.
"Good night to you too." Peter said back to him, gracious that he finally left.
Once the plant was gone, Peter adjusted himself to lay back. His eyes were heavy, and he was exhausted, but he refused to fall back asleep, not after what happened no more than 20 minutes prior. No. He was definitely not falling back to sleep that night, or anytime in the near future. Not with that voice booming in the back of his head. He could handle the pain, he could handle the memories. But, "I will not let go, I will always be with you…" He could not handle the eerily familiar voice haunting his mind.
So he spent the rest of the night staring at the ceiling, attempting, and failing, to think about anything else.
I am not sure whether Peter can understand Groot or not, but for the sake of adorable moments, were just gonna roll with it.