Ok just hear me out for a sec. So, I'm guessing that Kiribb perceive himself as 2 person's, black hair as his true self and red hair as the better version of himself. And that's why in the middle of the seggs his hair goes full black as in him showing his "true"/insecure self to bakubb and when hi tells him that he'll love everything about him then the dream es like... The metaphor (a little bit sadistic) of Kiribb letting his insecure self and now he is just the "better version" （￣へ￣）
Ok just hear me out for a sec. So, I'm guessing that Kiribb perceive himself as 2 person's, black hair as his true self and red hair as the better version of himself. And that's why in the middle of the seggs his hair goes full black as in him showing his "true"/insecure self to bakubb and when hi tells him that he'll love everything about him then the dream es like... The metaphor (a little bit sadistic) of Kiribb letting his insecure self and now he is just the "better version" （￣へ￣）