攻德无量万受无疆
[gōng dé wú liàng wàn shòu wú jiāng]
Commonly used in the BL fandom. This term is derived from Buddhist terms. In the context of web literature, '攻' means 'seme' who takes the dominant role in a romantic/physical relationship, while '受' represents the submissive side (uke). '攻德无量，万受无疆' literally implies a dominator who has much grace with boundless followers.