diff --git a/proto/SitReq.proto b/proto/SitReq.proto
new file mode 100644
index 0000000..4a2b76e
--- /dev/null
+++ b/proto/SitReq.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+import "Vector.proto";
+
+message SitReq {
+	uint64 chair_id = 1;
+	Vector position = 2;
+}
diff --git a/proto/SitRsp.proto b/proto/SitRsp.proto
new file mode 100644
index 0000000..16b3097
--- /dev/null
+++ b/proto/SitRsp.proto
@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+import "Vector.proto";
+
+message SitRsp {
+	uint32 entity_id = 2;
+	Vector position = 3;
+	uint64 chair_id = 4;
+}