Kaizoku (Pirate) Game is a yaoi manga by Takagi Ryou, centering around a prince named Yuuri who is kidnapped by maurading pirates, the leader of which looks disturbingly like a Gunter/Gwendal cross. The plot goes something like:
not! Yuuri: I can't trust pirates! They're nasty! Evil! Cruel! And - surprisingly hot. not! Gunter: *kisses* Not! Yuuri: *melts*
Couldn't resist this series, for rather obvious reasons.