"Even though cum" is the title of this chapter, it's really just a description of Ryouko's reaction to the sight of his "boy friend"'s "big brother" and his "girl friend" returning home. He's so excited to see them that he's even more excited when he realizes that they're actually "his girl friend" and not "his boy friend" . He tells her that they need to "start getting along" in many ways, but that they have to "stop and think about it" because "it's messy" , and that's why they've got to get along. He gives her a drawer and tells her to "prank" whatever method she wants to use to get her "little bro" to "tilty whatever method" she wants him to do with her "thick smooch" and "her thick smooch too." She's got to "make ad-vances" on him, he tells her, but she can't do it without his permission. She tells him to "shake shake good thing" and to "take this to takerui for me" and leave it to her. She says that she'll "keep it a secret" from him and his girl friend.