1. Lovely photos of her both here and on your other posts.
2. I certainly would enjoy rooting and nutting in her.
3. Sounds like she is open to having someone root and nut in her. She is just nervous about being watched. So run with it.
a. Call her bluff, say "sure, you can do that but I have to be in the house/apartment/hotel suite to make sure you are safe.
Find out when can you come in.
Tell her, "honey, when I can tell you "you are the one I love?" I don't want to wait until you are finished and completely dressed. Maybe I could come in afterward while you two are still cuddling and tell you then. You could have a sheet over you if it makes you more comfortable.
b. Make sure to have a hidden web cam set-up in advance so you can watch even if you aren't there.
c. The guy could also call you on your cell phone and leave his phone on speaker phone. Just be sure to mute the phone at your end.
d. Hopefully the guy could add a touch of kink, put at least a blindfold on her, maybe tie or handcuff her wrists. Then you could watch without her knowing.
e. You could "fix" the lock bolt with some tape or paper in the door frame where the bolt goes. This way the door can "accidentally" swing open.
best of luck