@powerneed No, Melissa isn't doing the same thing Jack was doing. Firstly, Melissa and Yuri are both actually friends, but Yuri hasn't really met Jack before this chapter. Secondly, she's not protecting Yuri without her knowing about it, she told Yuri that Jack was stalking her and then made a plan and took action to stop Jack after that. Thirdly, she's not just stopping Jack for Yuri, she's also stopping Jack for her own selfish reasons, including just wanting to punish her brother for behaving in a manner she finds to be creepy.