Haven't read this yet, can someone tell me if it's worth it? What flag?

YESSS READ IT!

Idk about the seme , don’t think he’s a red flag but the uke is definitely a black flag, he’s the powerful resilient type.

The relationship between the top and bottom is consensual and there's never any parts where one assaults the other. They obviously both are killers, so that's the only real reason why they'd be considered a red or black flag. Otherwise, there's no SA or anything between the MC and ML, if that is what you were worried about ^-^