We show that the introduction of two worldline parameters allows to drastically simplify computations in the effective field theory approach to the two-body problem in General Relativity, effectively removing half of the complexity in Feynman diagrams. These parameters obey a polynomial equation whose perturbative expansion recovers an infinite series of diagrams. Futhermore, we show that our equations define an effective two-body horizon for interacting black holes in General Relativity; in the circular orbit case, it corresponds to the smallest conceivable separation up to which the orbit can remain circular. We expect our results to simplify higher-order computations in the two-body problem, as well as to give insights on the nonperturbative properties of interacting binaries.