If you want an idea for a dirty text to send to a guy, just tell him things like how you are going to give him oral or what you are going to do in bed with him.
Trust me, this will work, I'm a guy.
It doesn't matter how you say it, if you say those things the message will be dirty enough to turn this guy on.
You can also tell him you are turned on and horny for him, and that you need to "do something about it".
Ok, I'm hot under the collar now, I think he will be too! Good luck