Who is Aislinn from The Wolf and the Dove and what is their importance?

Aislinn soon responds to Wulfgar physically but isn't able to come to him willingly because she feels their love should be sanctified by marriage. Neither admits to their love for some time, though Aislinn is the first to say that she wonders if what she feels could be love. At that point, she is horrified by the thought, continuing to hold the position of little more than a slave in Wulfgar's household. There's no exact moment when the two admit to their love and both seem to come by the understanding gradually.