Very nice! That is a shame that they're both remote. Is it 100% or do they ever go into the office?
Definitely some great advice about building trust and having her start to confide in him (and viceversa). That is the oldest trick in the book when it comes to seducing women, and how my wife fell for her co-worker and ultimately turned me into a cuck. The best would be if she can "vent" to him about something relating to you - he comes a shoulder to cry on so to speak, a good listener, someone that "understands" her. Golf could be a good in. Do you play often? Given the nature of the intro, that could be something he brings up from time to time to bait her into complaining about how often you play. An excellent response would be something to the effect of - "oh wow, I only play a lot because I'm single, if I were married to you I would spend all the time I can with you
"