The goal of the play is to arouse and get aroused, but forbid the release. This will help accumulate desire and make real-life interaction more intense.
Start your correspondence with an innocent “Thinking of you”, then tell what you are wearing. You can describe in more detail your underwear or other garment that is your partner’s particular turn-on. Describe what you would do if you were close to each other right now. Linger on the fetishes, let your imagination go and describe the process in more detail.
The partner can masturbate in the process, but the main rule is — don’t climax! Take a break if he/she is ready to come and go back to flirting later.