By a process of trial and error you and the other big nasties found
s more practical method of doing in humanity.
You and the others kidnapped human wives and girlfriends ,took
them to the caves and fed them a soup containing the usual potoes
peas and carrots,and also had your human head rolling about at the
bottom of the soup cauldron,infecting the broth with some of the
transformational dragon magic and a bit o' blonde hair.
After a two week feeding the human would be looked at closely and
when you saw a flicker of red dragon's fire in the back of the eye
in the unsuspecting human female,you knew the seed had taken root in
the host human.
Then a few forgetfullness spells and Bertha,the missing wife
of Olaf the Miller,would find herself back in her dwelling,with no
recollection where she'd been the last two weeks.
Then Olaf would get into bed with her,eager for some hanky panky.