He couldn't stop the smile that spread on his lips when Percy said he was irresistible. It was one thing to say it yourself, but to know that Percy really did think so made him smile. Even if he did so without even breaking the kiss.
'Far too-,' he agreed, mumbling against Percy's lips, a sharp intake of breath as Percy stroked him more decisively breaking off his sentence. Swallowing, he tried to keep kissing Percy, refused to admit that his body was too focused on Percy's hand and the sensation it created for him to be able to do much more than breathe into Percy's mouth, too feel Percy breathe into his own. Every now and then he'd catch himself, kiss with more meaning and purpose, run his tongue along Percy's lips and then he'd be lost in another sensation and forget.
His hand didn't forget moving, however, and with every stroke he mimicked Percy's speed and pace, groaning as he felt Percy respond to his touch.