Dear TT and He,
I hope this email finds you both well. I wanted to reach out to you both because I have a small request that I hope you can help me with. I was wondering if the two of you would be willing to take me out for dinner sometime soon?
I know it may seem like a small thing, but I would really appreciate it if you could spare some time to catch up over a meal. I promise it won't take too much of your time, and I would be honored if you could treat me to a delicious dinner.
Your company is always a pleasure, and I truly value our friendship. I hope you will consider my request and let me know if there is a date and time that works for you both.
Thank you for taking the time to read my email, and I look forward to hearing back from you soon.
Best regards,
[Your Name]