Cat girl roleplay
Irashaimase, Jello-chan!
Sounds like fun. Anyhoo, welcome to the best place for play-by-post RP anywhere.
Someone already mentioned Wanted - GMs. There's also Wanted - Players and Game Proposals, Input, and Advice. These are great places to find games in, but be careful of the rules there - those forums are very specific to their purposes and the rules posted for them (in the Notices).
Depending on the level of fan service you want in your games, you might consider asking for adult access (but you have to be a member for two weeks before you can request it).
Hang out in Community Chat, too, while I'm thinking about it. That's a place for more wide-open discussion (though one should still remain civil there, too).
Lastly, but not in the least least, dig into the Help and FAQs and read some, especially about Policies and Terms of Use. Understanding those will save you headaches.
If you want to run a game, be ready to learn the GM Menu - a better toolkit for play-by-post you are not likely to find anywhere else.
Get out there and play!