diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/Message.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/Message.kt
index e76a0b03d..269203099 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/Message.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/Message.kt
@@ -270,7 +270,7 @@ interface MessageMetadata : SingleMessage {
  */
 @SinceMirai("0.34.0")
 @MiraiExperimentalAPI
-interface ConstrainSingle<M : Message> : MessageMetadata {
+interface ConstrainSingle<out M : Message> : MessageMetadata {
     val key: Message.Key<M>
 }
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageSource.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageSource.kt
index 2edbbfbb4..0fbf2ef61 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageSource.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageSource.kt
@@ -39,12 +39,12 @@ import kotlin.jvm.JvmSynthetic
  */
 @OptIn(MiraiExperimentalAPI::class)
 @SinceMirai("0.33.0")
-sealed class MessageSource : Message, MessageMetadata, ConstrainSingle<OnlineMessageSource> {
+sealed class MessageSource : Message, MessageMetadata, ConstrainSingle<MessageSource> {
     companion object Key : Message.Key<MessageSource> {
         override val typeName: String get() = "MessageSource"
     }
 
-    final override val key: Message.Key<OnlineMessageSource> get() = OnlineMessageSource
+    final override val key: Message.Key<MessageSource> get() = Key
 
     /**
      * 所属 [Bot]
@@ -153,13 +153,6 @@ sealed class OnlineMessageSource : MessageSource() {
             abstract override val target: QQ
             final override val subject: QQ get() = target
             //  final override fun toString(): String = "OnlineMessageSource.ToFriend(target=${target.id})"
-
-            @PlannedRemoval("1.0.0")
-            @Deprecated("for binary compatibility until 1.0.0", level = DeprecationLevel.HIDDEN)
-            @get:JvmName("sender")
-            @get:JvmSynthetic
-            final override val sender2: Bot
-                get() = sender
         }
 
         abstract class ToTemp : Outgoing() {
@@ -188,8 +181,7 @@ sealed class OnlineMessageSource : MessageSource() {
      */
     sealed class Incoming : OnlineMessageSource() {
         companion object Key : Message.Key<Incoming> {
-            override val typeName: String
-                get() = "OnlineMessageSource.Incoming"
+            override val typeName: String get() = "OnlineMessageSource.Incoming"
         }
 
         abstract override val sender: QQ // out QQ
@@ -199,8 +191,7 @@ sealed class OnlineMessageSource : MessageSource() {
 
         abstract class FromFriend : Incoming() {
             companion object Key : Message.Key<FromFriend> {
-                override val typeName: String
-                    get() = "OnlineMessageSource.Incoming.FromFriend"
+                override val typeName: String get() = "OnlineMessageSource.Incoming.FromFriend"
             }
 
             abstract override val sender: QQ
@@ -211,8 +202,7 @@ sealed class OnlineMessageSource : MessageSource() {
 
         abstract class FromTemp : Incoming() {
             companion object Key : Message.Key<FromTemp> {
-                override val typeName: String
-                    get() = "OnlineMessageSource.Incoming.FromTemp"
+                override val typeName: String get() = "OnlineMessageSource.Incoming.FromTemp"
             }
 
             abstract override val sender: Member
@@ -223,8 +213,7 @@ sealed class OnlineMessageSource : MessageSource() {
 
         abstract class FromGroup : Incoming() {
             companion object Key : Message.Key<FromGroup> {
-                override val typeName: String
-                    get() = "OnlineMessageSource.Incoming.FromGroup"
+                override val typeName: String get() = "OnlineMessageSource.Incoming.FromGroup"
             }
 
             abstract override val sender: Member
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/QuoteReply.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/QuoteReply.kt
index e19fce819..122b7a929 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/QuoteReply.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/QuoteReply.kt
@@ -9,11 +9,12 @@
 
 @file:JvmMultifileClass
 @file:JvmName("MessageUtils")
-@file:Suppress("NOTHING_TO_INLINE")
+@file:Suppress("NOTHING_TO_INLINE", "unused")
 
 package net.mamoe.mirai.message.data
 
 import kotlinx.coroutines.Job
+import net.mamoe.mirai.Bot
 import net.mamoe.mirai.message.MessageReceipt
 import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.SinceMirai
@@ -47,6 +48,31 @@ class QuoteReply(val source: MessageSource) : Message, MessageMetadata, Constrai
     override fun contentToString(): String = ""
 }
 
+@get:JvmSynthetic
+inline val QuoteReply.id: Int
+    get() = source.id
+
+@get:JvmSynthetic
+inline val QuoteReply.fromId: Long
+    get() = source.fromId
+
+@get:JvmSynthetic
+inline val QuoteReply.targetId: Long
+    get() = source.targetId
+
+@get:JvmSynthetic
+inline val QuoteReply.originalMessage: MessageChain
+    get() = source.originalMessage
+
+@get:JvmSynthetic
+inline val QuoteReply.time: Int
+    get() = source.time
+
+@get:JvmSynthetic
+inline val QuoteReply.bot: Bot
+    get() = source.bot
+
+
 @JvmSynthetic
 suspend inline fun QuoteReply.recall() = this.source.recall()