Percy didn't know what that meant nor was he going to stop Cass to ask an explanation. He certainly didn't feel remarkable, but again, he wasn't about to argue the matter when they were fucking.
He held on Cass tight, but eventually his hand slipped between their bodies and his forgers closed around his cock. He started to stroke faster, in time with Cass' thrusts. His eyes stayed on Cass, unwilling to look away after so long.
Time passed. Grunts and skin on skin were the only noises they could hear in the room. He didn't know how long it took, but the tingle at the base of his spine grew and spread and soon he was coming, clenching around Cass as he shook through the aftermath.