when i finish, I have two ideas, one is a total must, the other... well i'm seeing if its possible.
1) Legend of the Freaks: The 2nd GEN.- which a series dedicated to my MC's kids, and deals with the lose ends there parents kept coming back to kicked the kids in the ass, ex) my 4th's book evil villian's nephew (also a freak) coming for revenge/world domination. Then my 7th book with this horrible twist! (see what my MC's dont know now is while they were in sector 6 being experimented on, they took something very dear to them, then an evil dr. minulated it and this whole book revolves around kids they didnt know they had (with eachother!) that were created by this doctor, to take them down. Fight fire with fire kind of thing) And then the House 2.0.
My second idea is to have an adult series continuation spinoff thing, because i've planned stories up until they are like 27 but you cant call that YA anymore, because there all married and start having kids, and it deals with them all working inside the FBI and the really messed up strange cases they are assigned too