diff --git a/src/main/kotlin/cn/rtast/fancybot/items/SetuItem.kt b/src/main/kotlin/cn/rtast/fancybot/items/SetuItem.kt
index 3501fd6..141ead2 100644
--- a/src/main/kotlin/cn/rtast/fancybot/items/SetuItem.kt
+++ b/src/main/kotlin/cn/rtast/fancybot/items/SetuItem.kt
@@ -8,23 +8,32 @@
 package cn.rtast.fancybot.items
 
 import cn.rtast.fancybot.entity.Setu
+import cn.rtast.fancybot.niuziManager
 import cn.rtast.fancybot.util.Http
 import cn.rtast.fancybot.util.item.Item
+import cn.rtast.fancybot.util.str.encodeToBase64
 import cn.rtast.fancybot.util.str.fromArrayJson
 import cn.rtast.rob.entity.GroupMessage
 import cn.rtast.rob.util.ob.MessageChain
 import cn.rtast.rob.util.ob.OneBotListener
+import java.net.URI
 
 class SetuItem : Item() {
     override val itemNames = listOf("setu", "色图", "st")
     override val itemPrice = 10.0
 
     override suspend fun redeemInGroup(listener: OneBotListener, message: GroupMessage, after: Double) {
-        val url = Http.get("https://api.rtast.cn/api/setu")
-            .fromArrayJson<List<Setu>>().first().urls.large
+        val response = Http.get("https://api.rtast.cn/api/setu")
+            .fromArrayJson<List<Setu>>().first()
+        if (response.r18) {
+            niuziManager.updateLength(message.sender.userId, itemPrice)
+            message.reply("不好意思这张图片是R18所以不能发~, 牛子长度已经退还~")
+            return
+        }
+        val imageBase64 = URI(response.urls.large).toURL().readBytes().encodeToBase64()
         val msg = MessageChain.Builder()
             .addAt(message.sender.userId)
-            .addImage(url)
+            .addImage(imageBase64, true)
             .build()
         listener.sendGroupMessage(message.groupId, msg)
     }