diff --git a/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingAggregate.kt b/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingAggregate.kt
index 93ba013..a7dd011 100644
--- a/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingAggregate.kt
+++ b/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingAggregate.kt
@@ -19,10 +19,12 @@ class BorrowingAggregate() {
 
     @AggregateIdentifier
     lateinit var borrowing: UUID
+    var copyState = CopyState.AVAILABLE
+    var borrower: Party? = null
 
     @CommandHandler
     constructor(command: RegisterNewBorrowing): this() {
-        applyEvent(RegisteredNewBorrowing(command.isbn, UUID.randomUUID()))
+        applyEvent(RegisteredNewBorrowing(command.isbn, UUID.randomUUID(), command.userId))
     }
 
     @CommandHandler
@@ -51,14 +53,18 @@ class BorrowingAggregate() {
         this.copyState = CopyState.AVAILABLE
         this.borrower = null
     }
-    var copyState = CopyState.AVAILABLE
-    var borrower: Party? = null
+
+    @EventSourcingHandler
+    fun on(evt: RegisteredNewBorrowing) {
+        this.borrowing = evt.uuid
+    }
+
 }
 
 data class FindBorrowings (val isbn: String)
 
-data class RegisterNewBorrowing (val isbn: String)
-data class RegisteredNewBorrowing (val isbn: String, val uuid: UUID)
+data class RegisterNewBorrowing (val isbn: String, val userId: UUID)
+data class RegisteredNewBorrowing (val isbn: String, val uuid: UUID, val userId: UUID)
 
 data class BorrowCopy(@TargetAggregateIdentifier val copyId: UUID, val borrower: Party)
 data class ReturnCopy(@TargetAggregateIdentifier val copyId: UUID, val borrower: Party)
diff --git a/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingController.kt b/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingController.kt
index fbb8c91..06d7d9e 100644
--- a/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingController.kt
+++ b/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingController.kt
@@ -7,11 +7,13 @@ import org.springframework.http.HttpStatus
 import org.springframework.web.bind.annotation.ExceptionHandler
 import org.springframework.web.bind.annotation.PostMapping
 import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RestController
 import org.springframework.web.server.ResponseStatusException
 import java.util.*
 
 @RestController
+@RequestMapping(path = ["/api"])
 class BorrowingController(
     val commandGateway: CommandGateway
 ) {
diff --git a/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingReadModel.kt b/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingReadModel.kt
index dc69071..a32e4ec 100644
--- a/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingReadModel.kt
+++ b/backend/src/main/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowingReadModel.kt
@@ -1,6 +1,8 @@
 package com.ksidelta.libruch.modules.borrowing;
 
+import com.ksidelta.libruch.modules.example.BookState
 import org.axonframework.eventhandling.EventHandler
+import org.axonframework.queryhandling.QueryHandler
 import org.springframework.data.repository.CrudRepository
 import org.springframework.stereotype.Repository
 import org.springframework.stereotype.Service
@@ -9,25 +11,58 @@ import javax.persistence.Entity
 import javax.persistence.Id
 
 @Service
-class BorrowingEventProcessor(val borrowingReadModelRepository: BorrowingReadModelRepository) {
+class BorrowingEventProcessor(
+    val borrowingReadModelRepository: BorrowingReadModelRepository,
+    val borrowingCopyReadModelRepository: BorrowingCopyReadModelRepository
+) {
     @EventHandler
-    fun handle(event: RegisteredNewBorrowing) =
+    fun handle(event: RegisteredNewBorrowing) {
+
         borrowingReadModelRepository.save(
             BorrowingOfferModel(
-                id =  event.uuid,
+                id = event.uuid,
                 isbn = event.isbn
             )
         )
+
+        borrowingCopyReadModelRepository.save(BorrowingCopyModel(
+            id = event.uuid,
+            isbn = event.isbn,
+            status = BookState.BORROWED,
+            userId = event.userId
+
+        ))
+    }
+
+    @QueryHandler
+    fun queryBorrowedBooks(event: QueryBorrowedBooks): List<BorrowingCopyModel> =
+        borrowingCopyReadModelRepository.findByUserId(event.userUUID)
 }
 
+data class QueryBorrowedBooks(val userUUID: UUID)
+
 @Repository
 interface BorrowingReadModelRepository : CrudRepository<BorrowingOfferModel, UUID> {
     fun findByIsbn(isbn: String): BorrowingOfferModel?
 }
 
+@Repository
+interface BorrowingCopyReadModelRepository : CrudRepository<BorrowingCopyModel, UUID> {
+    fun findByUserId(userUUID: UUID): List<BorrowingCopyModel>
+}
+
 @Entity(name = "borrowing_offer_model")
 data class BorrowingOfferModel(
     @Id
     val id: UUID,
     val isbn: String
 )
+
+@Entity(name = "borrowed_copy_model")
+data class BorrowingCopyModel(
+    @Id
+    val id: UUID,
+    val isbn: String,
+    val status: BookState,
+    val userId: UUID
+)
diff --git a/backend/src/test/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowBookUseCase.kt b/backend/src/test/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowBookUseCase.kt
new file mode 100644
index 0000000..fa9eef0
--- /dev/null
+++ b/backend/src/test/kotlin/com/ksidelta/libruch/modules/borrowing/BorrowBookUseCase.kt
@@ -0,0 +1,65 @@
+package com.ksidelta.libruch.modules.borrowing
+
+import com.ksidelta.libruch.BaseTest
+import com.ksidelta.libruch.MockUserArgumentResolver
+import com.ksidelta.libruch.modules.example.BookState
+import com.ksidelta.libruch.utils.eventuallyConfigured
+import io.kotest.matchers.shouldBe
+import kotlinx.coroutines.future.await
+import kotlinx.coroutines.runBlocking
+import org.axonframework.commandhandling.gateway.CommandGateway
+import org.axonframework.messaging.responsetypes.ResponseTypes
+import org.axonframework.queryhandling.QueryGateway
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.test.web.client.TestRestTemplate
+import java.util.*
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class BorrowBookUseCase : BaseTest() {
+
+    @Autowired
+    lateinit var testRestTemplate: TestRestTemplate
+
+    @Autowired
+    lateinit var gateway: CommandGateway
+
+    @Autowired
+    lateinit var queryGateway: QueryGateway
+
+    @Autowired
+    lateinit var mockUserArgumentResolver : MockUserArgumentResolver;
+
+        final val isbnConstant = "1234"
+    @Test
+    fun test() = runBlocking {
+        val newBorrowingCompletableFuture = gateway.send<UUID>(RegisterNewBorrowing(isbnConstant));
+        val uuid = newBorrowingCompletableFuture.await()
+        testRestTemplate.postForEntity("/api/borrow", BorrowCopyDTO(uuid), Void::class.java)
+        Assertions.assertTrue(true)
+
+        val userUUID = mockUserArgumentResolver.user.id
+        val query = suspend {
+            queryGateway.query(
+                QueryBorrowedBooks(userUUID),
+                ResponseTypes.multipleInstancesOf(BorrowingCopyModel::class.java)
+            ).await()
+        }
+
+        eventuallyConfigured {
+            query() shouldBe
+                    listOf(
+                        BorrowingCopyModel(
+                            status = BookState.BORROWED,
+                            id = uuid,
+                            isbn = isbnConstant,
+                            userId = userUUID
+                        )
+                    )
+        }
+
+
+    }
+}
\ No newline at end of file