Paysite? Why?
Nobody pays for pr0n.
akiba sucks. they turned it into a paylink and Keep2Share pay per download file hosting affiliate scam site after their server crash. Haven't bother with them since last year's crash.
They just take free links from other sites, and put them on theirs.
Why not just go straight to the source?
141jav.com
torrentav.net
3xplanet.com
tokyotosho.se
sukebei.nyaa.se
forum.scanlover.com
javlibrary.com
The generic term for it is 男装, so you might get some results from that.
For some strange reason DMM.co.jp has a tag for the reverse, but not 男装 (most of those works are shoved under その他フェチ (other fetishes))
Thankfully, I recall a series from SOD that should be exactly what you're looking for: 男子の格好をしているオンナのコは好きですか? (basically, girls that act like boys).
Enjoy.