Vulturing

[Vania]

The act of one friend using pre-existing, platonic [rapport] with another friends ex or otherwise closely connected individual in an attempt to [get play] and/or sex without having to meet and deal with new people on their own.
Often a trait of sexually inexperienced peoples who prefer that their friends [do the work] of [courting] a girl/guy while the vulturer lays back and wait for the relationship to fail so that they may move in under the guise of friendship.
Ironically, vulturing nearly always fails in its employment as the concept of one friend taking advantage of another friends failure is a sign of insecurity and romantic incompetence on the part of the vulturer. This, obviously, is universally acknowledged as unattractive from the perspective of any potential mate.
This definition also applies to friend-with-benefits and to a lesser extent, siblings.