Dear Mrs. Sullivan,

Just in case you were wondering, my name is Amanda. I'm 36, recently divorced, I work as a university admin assistant at your son's university.

I met your son Kevin at the university gym, where I often go to work out some stress, and take in some of the sights - the younger athletic men in attendance.

I hope you an understand my interest in Kevin. Thouth he's just 21, he is actually quite skilled at some things. In other matters, he simply needs to be taught.  So, yes. That's why he he's been staying with me at my house more and more. I'm sure you can understand. It's good for a young man. 

Sincerely, Amanda.