Spell out numbers: one hundred twenty-five, not 125.
After the introductory phrase, the word order of the first sentence is kinda wonky… The next male in his bloodline’s soul? I didn’t know bloodlines had souls, nor that those souls could be comprised of people. *shakes head* Anyway, I changed the word order so the sentence says what it’s supposed to. I also broke up the second sentence into two for flow and clarity.
One hundred twenty-five years ago, an ancestor of yours traded the soul of the next male in his bloodline to Lucifer for untold power. A son is yet to be born. Lucifer is sick of waiting and wants your infant daughter.