Ren felt his body being moved. Ryuuho had catched him in time, luckily.
He felt himself being tucked in. But then a strange sensation overwhelmed his senses. His arm itched for a bit as if it were touched by hair. But after that he felt a warm, tingling sensation on his lips.
He was being kissed. 
Realizing this made his eyes open slowly. The sight surprised him as he saw that Ryuu was the one kissing him.
Ren was now fully awake and started kissing back, to obvious surprise of Ryuu.
Ren reached with one had for Ryuu's hair and with his other to his arm. He pulled his arm which made Ryuu fall onto Ren's body. Ren took it even further and turned his body, making him lay on top of the grumpy male.
Ren broke of the kiss for a bit to let them both catch their breaths. As he saw Ryuu's mouth open a bit, he took action. He pressed his lips on Ryuu's again but slid his tongue inside too this time, exploring his mouth before pressing his against his friends.