diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/Relationship.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/Relationship.kt
index 87bccaea..813294f7 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/Relationship.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/relationship/Relationship.kt
@@ -52,7 +52,7 @@ class Relationship(
         addDomainEvent(relationshipEventFactory.createEvent(RelationshipEvent.UNFOLLOW_REQUEST))
     }
 
-    fun block() {
+    private fun block() {
         unfollow()
         blocking = true
         addDomainEvent(RelationshipEventFactory(this).createEvent(RelationshipEvent.BLOCK))
@@ -81,7 +81,7 @@ class Relationship(
         mutingFollowRequest = false
     }
 
-    fun followRequest() {
+    private fun followRequest() {
         require(blocking.not())
         followRequesting = true
         addDomainEvent(RelationshipEventFactory(this).createEvent(RelationshipEvent.FOLLOW_REQUEST))
@@ -123,6 +123,16 @@ class Relationship(
         return result
     }
 
+    abstract class InternalRelationshipDomainService {
+        protected fun block(relationship: Relationship) {
+            relationship.block()
+        }
+
+        protected fun followRequest(relationship: Relationship) {
+            relationship.followRequest()
+        }
+    }
+
     companion object {
         fun default(actorId: ActorId, targetActorId: ActorId): Relationship = Relationship(
             actorId = actorId,
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/relationship/RelationshipDomainService.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/relationship/RelationshipDomainService.kt
index b59c0319..7c35d6c0 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/relationship/RelationshipDomainService.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/relationship/RelationshipDomainService.kt
@@ -17,17 +17,28 @@
 package dev.usbharu.hideout.core.domain.service.relationship
 
 import dev.usbharu.hideout.core.domain.model.relationship.Relationship
+import dev.usbharu.hideout.core.domain.model.relationship.Relationship.InternalRelationshipDomainService
 import org.springframework.stereotype.Service
 
 @Service
-class RelationshipDomainService {
+class RelationshipDomainService : InternalRelationshipDomainService() {
     fun block(relationship: Relationship, inverseRelationship: Relationship) {
         require(relationship != inverseRelationship)
         require(relationship.actorId == inverseRelationship.targetActorId)
         require(relationship.targetActorId == inverseRelationship.actorId)
 
-        relationship.block()
+        block(relationship)
         inverseRelationship.unfollow()
         inverseRelationship.unfollowRequest()
     }
+
+    fun followRequest(relationship: Relationship, inverseRelationship: Relationship) {
+        require(relationship != inverseRelationship)
+        require(relationship.actorId == inverseRelationship.targetActorId)
+        require(relationship.targetActorId == inverseRelationship.actorId)
+        require(inverseRelationship.blocking.not())
+        require(relationship.blocking.not())
+
+        followRequest(relationship)
+    }
 }