Examples from literature

• He gave himself altogether up to pleasure, and imagined there was no sage like a boon companion. 
• He is said to have been a boon companion of Richard II., and remained faithful to that king. 
• He must have been something of a wit, too, in his own circles, having any number of boon companions. 
• Not only was he Pitt's political colleague, but in private life his boon companion. 
• There is a hum of pleasant talk, for each man is a right boon companion.