A: "Harry, do you know about the conservation of energy?" Harry shook his head.
A flew up on a broomstick and swung it hard at the flying Golden Snitch. A moment later, Professor Quirrell let out a heart-rending scream: "My balls!!!"
With a serious expression, A asked his little brother Harry, "Do you understand now? The conservation of matter means that energy can be transferred from one object to another, and can change from one form to another, but energy will never disappear."
Harry: "...I really want to say I didn't see anything, but you and Professor Quirrell would both kill me... TAT~~"
Snape looked smug. Dumbledore burst out laughing. Hermione and Ron turned away and wept bitterly: "Brother, it hasn't been easy!"
A's traits: cunning, domineering, genius (fake), snarky, lecherous (fake), money-grubbing (secretly), and a shota fan.
Multiple pairings, with separate one-on-one endings.
Fandoms featured: Harry Potter, CSI: Crime Scene Investigation, Lizzie McGuire, The Big Bang Theory, Smallville, Twilight.
I think the most likely reason is that the author has forgotten to add it.
Ask a few questions... Is the protagonist Gong? Will it be a trap? What is CP? Is the update probably daily? Weekly update? Monthly updates?