When Elane first introduced her friend Katya to her parents she probably didn't think that her friend would develop such a thirst for older men, her father in particular. Just after a while after Katya realized that fact she opened herself to Kjartan and Laura who to her surprise were not against such arrangements.
With mutual consent she turns up here and there for a meeting with Elane's parents.
Or like in this case only with Kjartan to receive a proper rutting from her much bigger "dad snep" after realising that just sucking his dick won't cut it so he pins her down and eventually busts deep into her. That girl hopefully doesn't bite more than she can swallow and it better be a safe day.