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im guessing that the seme fell for the uke in middle school but was very in denial about it and when the uke finally graduated, the semester was like "thank god he's gone now i don't have to deal with the way my heart hurt when he held that girl's hand (dated?) as he walked out of my life forever" and so because he's an unreliable narrator, he's leading us as readers to believe that he doesn't like the uke because of how energetic/child-like he is, when in reality, he's been in love with the uke this whole time (why else would he go with the uke no questions asked and get hard immediately in ch 3)