Defo recommend the Love handles or Hip grips, this gives your pillion a seens of safety
Best also to give your pillion a few ground rules to start with lol
1 try and relax
2 Move with the Rider and not the bike
3 Enjoy the experainace of being n the back of the bike

As some of us know anyway the pillion will love the bike so much that they themselves will end up becoming a biker