I'd be interested in either pairing, probably an older brother if you prefer that. You can play by thread in the public and private areas, by PM between each other, and of course by IM if you wish to with another. If you have a profile( Such as Flist or Rabbit Hole) of your kinks, nos, favorites, etc. It helps to post a link to it in a request thread so partners know more about a possible scene together and avoid having to change or correct things you don't like. I think you'd also get more interest if you say at least a bare bones plot for it, a few sentences helps to brainstorm further.
If you look in request threads you'll see what I mean. Many have flist and rabbit hole links in their signatures, and plot ideas from a sentence to many paragraphs.