Topological sort where some nodes can't come in between two other nodes
EDIT: As pointed out in the comments this doesn't work!
Copy your graph into $G'$ and for every triple of nodes $(u,v,w)$, if NotBetween$(u,v,w)$ then add the edges $v\rightarrow u$ and $w\rightarrow v$ to $G'$ (if they don't exist already). If the graph has a cycle the problem is infeasible. Otherwise the topological sort on this new graph $G'$ is a valid topo sort for $G$ respecting NotBetween.
This is clearly $O(V^3)$ because you can implement this with 3 nested loops, then resulting graph has at most $O(V^2)$ edges, and the topological sort of $G'$ will take time $O(V^2)$.
If your relation NotBetween is not a black box and actually has some &quot;known shape&quot; you might be able to skip some triples and do better.