diff --git a/src/kyupy/circuit.py b/src/kyupy/circuit.py
index b3fd272..aaad109 100644
--- a/src/kyupy/circuit.py
+++ b/src/kyupy/circuit.py
@@ -96,10 +96,10 @@ class Node:
         by allocating an array or list :code:`my_data` of length :code:`len(n.circuit.nodes)` and
         accessing it by :code:`my_data[n.index]` or simply by :code:`my_data[n]`.
         """
-        self.ins: list[Line] = GrowingList()
+        self.ins: GrowingList[Line] = GrowingList()
         """A list of input connections (:class:`Line` objects).
         """
-        self.outs: list[Line] = GrowingList()
+        self.outs: GrowingList[Line] = GrowingList()
         """A list of output connections (:class:`Line` objects).
         """
 
@@ -615,6 +615,21 @@ class Circuit:
             if marks[n]:
                 yield n
 
+    def fanout(self, origin_nodes):
+        """Generator function to iterate over the fan-out cone of a given list of origin nodes.
+
+        Nodes are yielded in topological order.
+        """
+        marks = [False] * len(self.nodes)
+        for n in origin_nodes:
+            marks[n] = True
+        for n in self.topological_order():
+            if not marks[n]:
+                for line in n.ins.without_nones():
+                    marks[n] |= marks[line.driver]
+            if marks[n]:
+                yield n
+
     def fanout_free_regions(self):
         for stem in self.reversed_topological_order():
             if len(stem.outs) == 1 and 'dff' not in stem.kind.lower(): continue