Yay! Very happy that B emailed. And I vote for your original email and sending it soon. You are building the safe friendship bridge beautifully. I'm crossing my fingers that he calls you and you can try the appreciating / flirting thing on the phone with him.
Congrats on the new tutoring student. And I'm so glad that you and your Mom are connecting so well and you feel loved by her. That is such a wonderful gift that you have been able to give each other.
