Ryuuho, overwhelmed by the sudden attack from the taller male, felt the blood rushing towards his head. He blushed a nearly crimson shade of red. Ryuuho didn't resist, the emotions that stirred him up from within allowed him to get swept away by the moment. 

He wanted to fight back, resist the urge to go on, but the sudden intrusion of Ren's tongue made him overall weak. 
Ryuuho reacted by letting his own tongue twirl around Ren's, fighting for dominance- yet failed.

[i]'G-Guahh.. his tongue is inside my mouth.. I-It's my first.. kiss..'[/i], Ryuuho thought. The temperature rose quickly between the two males, and Ryuuho closed his eyes. 

A bit of fear developed inside of him, since he would not know what to do if Ren would do any more than this. The embarrassment would kill him. Hell, he never even thought that he would feel embarrassment.