Captive Magical Girl

The heroine is a magical girl. Tonight is just like another night where she fights demons lurking from the darkness. However, the clever demons set a trap for the magical girl. The magical girl was thrown into a some kind of a magic circle. No matter how hard she resist, she was eventually got drained ot due the weakening effect of the magic circle. Suddenly a succubus appeared in front of her declaring that she will absorbs every bit of the magical girl’s power by making her climax.