Preview:#熟女 清冷师尊——苏清寒 198p - XXAO的插画 - pixiv
水印透明度极低，阅读时几乎无感。除非仔细寻找，否则几乎无法察觉，不用担心影响观感。
The watermark has very low opacity and is almost invisible while reading. You will hardly spot it unless examining closely, and it won’t detract from visual enjoyment.