Problem with his Vessel

There's a problem with his vessel, or at least that's what Cas thinks. He keeps getting these stiff problems between his thighs! So what happens when he goes to Dean for a little help? Even worse, what happens when Heaven finds out about such "forbidden acts?" Naturally, all hell breaks loose! Rated M: Smut and Language. Top!Dean Bottom!Cas WingsKink, Angel in Heat.