Due to her lack of common sense from being raised in the Church, she told Riley that she wanted to have his children out loud and had no regard for where it happened. She wants his genes as a child of the Talbot Line (seeing Peter and Sir John in action), since she wishes to give birth to strong children as a way of making up time she feels she had lost as a woman while in the service of God.
She begins to fall in love with Riley when she witnesses his selflessness in saving others despite their protests of him being a monster. As the story progresses, it is shown that Xeneva has developed genuine romantic feelings for Riley due to his determination to protect his comrades even if he gets injured by doing so. She frequently tries to seduce Riley whenever she can because she wants to give birth to strong children. She also goes to lengths with sleeping with him naked without him knowing it, in the hopes he'll take advantage of her.
She also emits a scary aura whenever the other girls are getting closer to him.
Melina hated Xeneva at first, not wanting to associate with anyone who was a hunter because of what they have done, seeing her as simply a person who was forced ally with them for convenience. She originally maintained the view that Xeneva was going to move out at some point as she didn't want her in the pack, despite Riley's insistence that she was staying. She also got equally annoyed when her insults failed to cause the rather calm girl to react to her, causing her to get more and more angry towards her.
After the two were forced to fight with each other back to back though, Melina pulled a 180 turn and now loves her to bits. After seeing her fight Melina now sees Xeneva as an equal, and a person she can respect and as she does with all people she began to flirt with her nonstop. While this sudden change in tune caught both Xeneva and the pack off guard they developed a strong friendship with them frequently testing themselves against each other, being equally matched.
Though Melina sees her as a combat rival due to her falling for Riley as well, even going as far as wanting him to copulate with him: something Melina hasn't thought of.