Dick Grayson takes Slade's serum
I read this fic ages ago, and don't remember enough details to find it again. Somehow Dick Grayson had ended up in Slade's household. Slade offers Dick the serum and Dick accepts. There is acknowledgement that if Dick takes the serum, Bruce will never take him back, but Dick accepts anyway. I'm pretty sure Rose was also there, and Nightwing was training her. I'm also pretty sure that there was Slade/Dick relationship.
I'm not sure if the next bit is the same fic, or a different one, but I want to say that at some point Dinah was brought in as another trainer for Rose. I think Dinah's arm got broken? I'm pretty sure that at some point, Roy Harper and Lian also ended up being brought into the household, and that several other titans ended up dead.
This fic is at least a couple years old, too, but I think after the Teen Titans cartoon came out. This ring any bells for anyone?