[Slight flashback arc back to Saturday night in the POV of Gray and Walker]
"Would you get off me?"
After heading upstairs, Walker did not behave like Gray had told him to and instead acted in an obscene manner.
Since Gray was working out for the entire day, and facing off with Walker for the rest of the night, he was completely tired physically and mentally when he landed on top of Hunter's bed. Without knowing it, after his body landed on the single bed, he had already drifted off into dreamland. That is, until something caused him to wake up.
Gray felt something heavy land on him, causing him to be instantly shook awake by the impact. He subconsciously grabbed the object and moved in a violent manner, immediately throwing the thing underneath him. It did not take him long to realize that the object was actually another person, and that person was completely naked.