Early 929 Henry I., King of East Frankia, took the Hevelli chieftain Tugumir hostage. As far as is known, the sister of Tugumir went with him into captivity. In the same year she gave birth to Wilhelm, son of Otto (later Otto I. (the Great)), Henry's son and heir. The birth was out of wedlock and there seems to have been no intention for a marriage. Tugumir himself became a christian during this time and later served Otto as vassal.
What I find peculiar about this story is, that a hostage, i.e. someone who's home was just destroyed and who was deported to a foreign country, would freely be having intercourse with her captor's son. As far as my understanding goes, hostages were considered to be some kind of guarded guests, even if they were not treated too well. But this story has the stink of rape, as far as I understand it. But all biographies I have read seem to think nothing of it.
Maybe someone knows more about hostages and their treatment in the years between 900 and 1000 in the middle of Europe, and can explain to me, what I am missing here.
Thank you for reading.