I want this to go further, but I'm not sure it's my place as sub to initiate the conversation.
If you don't mind being a little sneaky, you can do what my ex-slave did. She liked the look of my ad but didn't think it was a slave's place to make the first move: so she created a sockpuppet account and mailed me from there saying "Look at this sub's ad, she sounds just right for you!" In due course, when she was safely at my feet, she owned up and took her punishment gladly. You could use the same trick to point your might-be-Master at your post here.
I'm not sure if he'd even want to take it further
Denu is right: if you don't ask you don't get. Go for it.