Long Chen just realized that he had the thing he needed to awaken the Blood Monarch's bloodline. When he received the blood, he only lacked the presence of the Snake Monarch. That's why he kept the blood in his storage.
So many things happened after that, which made him forget about it entirely.
"If you need phoenix Blood, isn't it the perfect opportunity?" The Demon Emperor asked, smiling. "Give me a minute."
The Demon Emperor took the control of the body, not realizing that Long Chen already had the phoenix blood. Instead, he decided to help Long Chen awaken the Bloodline of the little guy since he found the Snake Monarch's personality quite amusing. He wanted to see just what the Snake Monarch was capable of.
All the God Beast Kings were looking at the Snake Monarch weirdly since the Snake Monarch was talking such nonsense. The heartthrob of the Universe? Just what nonsense was he blurting?