((Hmmm, I was thinking... it comes to a point where she just wants to be the puppet master over them all and so, it can come about after the time when Zane leaves for a bit only to come back and find Serena has Eden under her control (shared with Jarrek's son of course) so she uses Eden as a sort of bargaining tool to control Zane. She'll know he still wants her, but won't know it's because he loves her and wants to protect her. Spare Eden a bit of the pain she can cause her in exchange for her own brother's obedience to her. Perhaps actually, Zane never leaves, only is cut off from Eden and an only stand by and watch.))
"Shhh," Serena said, eyes closed smile on her face as she laid her head upon Alicia's glorious breast, "You mistress wants to enjoy this moment. She'll get back to controlling you in a moment, my pet princess." Mmm what a term of affection. Pet princess. Serena's little chew toy. Later on... she'd spit out whatever she left behind.