I feel like at some point this was probably canon.
“Dad…I miss Karren.” Shuu wipes his eyes.
“I know, my boy.” Mirumo pats Shuu’s head.
“It’s just, like, I liked her…really liked her. Even when I thought she was a boy. Even when I was lovestruck for Kaneki.” Shuu glances at his dad. Sweat beads his brow. “I’ve just been convincing myself I wanted to eat him, but I wanted to love him this whole time.”
And he threw me off a roof and killed Karren.
“Shuu…I know.” Mirumo smiles.
“You do?” Shuu starts.
“No one is that heartbroken over food, not even a Tsukiyama,” Mirumo says with a smile. “I think you and Karren – or Kanae – would have been a wonderful couple.” He winks. “Your mother and I were bisexual, too.”
Shuu’s mouth drops open. “You are?”
“Is it that surprising? We tried to raise you to be open to whatever sexuality you wanted.” Mirumo half-smiles. “I’m proud of you, Shuu, and who you are and whomever you become.”
Shuu grabs his father and wraps his arms tight around him. “Thank you, Papa.”
Mirumo hasn’t had a hug like that since Shuu was little. Tears fill his eyes. “I love you, Shuu.”
“I love you too, Papa,” Shuu murmurs.