Yaoi manga with the seme being the one wearing a cock ring? ⁄(⁄ ⁄·⁄ω⁄·⁄ �...

http://www.mangago.me/read-manga/bond_z/

As a genital piercing ring called "Prince Albert", there's the author created yaoi by playing with this word.
http://www.mangago.me/read-manga/ever_after/ - Ch.1

Are those not the one you're looking for?

I'm so sorry for not replying! I want looking for BondZ, but i definitely was looking for Ever After! Thanks!