★ Reiko applies the same "love control" to Yuri before their summer pool trip. They go to the mall to buy Yuri a swimsuit, then hit the movies. Reiko purposely picks a movie that's trending for its good plot, but—surprise!—it's packed with aggressive adult scenes, including a passionate woman-on-woman scene. After the movie, Reiko just sits there in a daze. Yuri gets worried, touches her, and asks if she's okay. Reiko acts startled and confesses that she used to be attracted to both guys and girls. She claims she thought she was "cured" of her attraction to girls, but the movie made her realize those feelings are still there. Hearing this, Yuri is secretly ecstatic, realizing she actually has a shot at becoming Reiko's lover.
★ Naturally, Reiko planned the whole movie date just to push Yuri over the edge so she wouldn't give up on her feelings.
★ After a summer festival with the group, Reiko and Yuuki head to a park to light some sparklers. With tears in her eyes, Reiko tells Yuuki she’s terrified of how their relationship might change. Seeing her cry, Yuuki immediately comforts her. He promises he’ll always be by her side and that they'll face any changes together. In his head, he’s thinking the "change" means transitioning from childhood friends to lovers, and he wants to reassure her.
★ But guess what Reiko was actually crying about? She was stressing out that her grand NTR masterplan might fail if she got too greedy! She wanted to add a bunch more NTR candidates to her harem—delinquents, underclassmen, creepy older guys, teachers—just to satisfy her wild fetish. But she was worried that juggling too many guys would lower the success rate of her plan. Ironically, Yuuki’s heartfelt comfort is exactly what she needed. His encouragement to "not fear change" gives her the green light in her own twisted mind. Thanks to him, she’s completely re-energized and ready to aggressively expand her roster of guys to steal her away from him later.
★ She starts dropping hints to her own cousin, showing him photos of her and Yuuki with a "girl in love" expression just to make him jealous.
★ She actively hunts down street punks in dark alleys, playing the weak damsel in distress. But when one actually tries to assault her, she drops the act and beats the crap out of him. She refuses to let anyone ruin her timeline—the NTR must happen in high school, no earlier.
★ In class, she targets an otaku. She acts super friendly and shows interest in all his anime and manga. She thrives on the look of pure agonizing heartbreak on his face, knowing he thinks he’s too much of a loser to ever win her over from Yuuki. But Reiko won't let him quit. She reels him back in by giving him homemade Valentine's chocolate with a special personalized note.
★ As for Fuyuki, during their pool trip, Reiko's swimsuit top "accidentally" comes off. She immediately hugs Fuyuki to cover her bare chest while they wait for Yuuki and Yuri. Fuyuki literally gets a front-row seat (and feel) of her chest. The train ride home is thick with tension. Later, at the school culture festival, Fuyuki refuses to lose to Yuuki and invites Reiko to walk around. They hit up a cosplay room run by the theater club. Reiko puts on a wedding dress, and forces Fuyuki into a vampire tuxedo to take a picture. She even teases him, asking him to pose like a vampire biting her neck. Naturally, he refuses because he's totally embarrassed.
★ And for Yuri? While making Valentine's chocolate at Reiko's house, Yuri gets chocolate all over both their faces. Reiko drags her to the bathroom to wash up. While they’re literally bathing together in the tub, Reiko asks if Yuri likes anyone and promises to play wingman for her. Instead of naming someone else, Yuri closes the distance and confesses her burning love for Reiko right then and there. Yuri's obsession is fully locked in; she resolves never to hand Reiko over to anyone else.