How does an unemotional commander convince a very angry general to donate his sperm?

Andris is the stoic commander of the Celest Warriors. He was raised in a restrictive environment known as Warrior World where emotional attachment is frowned upon, and warriors must reproduce at least one child before they turn thirty. The planet is highly advanced, and in the year 2070, male warriors are able to experience pregnancy. To Andris, this duty is one he is hoping to be done with as soon as possible. The only problem is, Andris has no genetic equal on his planet.

Commander Thane Warner is Andris’ genetic equal, a highly decorated soldier with an IQ well above average. He is perfect. The only problem is, Thane is an alien from another planet and not very likely to volunteer.

Desperate to reproduce the perfect child who will one day replace Andris as commander of their military, Andris is ordered to find the alien commander and bring him back to Celest, by force, if necessary.

The dilemma; how does an unemotional commander convince a very angry general to donate his sperm?