Choose a really good friend that you can trust, make sure he's into some sex play with her, Judging by the photo that should be a gimme. We had my best friend, played cards which turned to strip cards. Don't push it, she has to be comfortable. We progressed through kissing, groping to him stroking her pussy then fingering her. From there eventually one evening she was so turned on she suggested more comfortable to lie on bed. Turned on she asked if I wanted my friend to go further with her and she fucked him. Happens every few weeks still, I always watch.