Peter Grill and the Philosopher's Time Vol. 6 (manga)

After winning the Grand Fighting Tournament, Peter Grill hoped he’d finally be allowed to marry his guild-mate sweetheart. However, being crowned the world’s strongest man comes with its own set of challenges: namely the queue of ogres, elves, and other warrior women lining up outside his door. They aren’t out to challenge him for his title–they want his seed for their bloodlines! What’s a strongman to do?!