Keep her company.

Against your best judgement you say she can stay at your house. You feel bad leaving her at some car shop waiting room for a few hours just to go to church. She excitedly hops in the passengers seat and you are quickly on your way.

You call up Sarah and say you are helping a friend with car trouble and are going to miss church. You tell the truth and she is happy with your kindness. Sarah says she will be doing a church event afterwards but will be home after and is excited to try on her beautiful ring. You feel bad knowing you won't be able to tell her the full truth but are glad she was understanding about it.

As you hit the second red light out of the mall see out of the corner of your eyes Fiona adjust the passengers seat back and stretch out. Her toned thighs are prominent and lead up to something that almost causes a gasp to escape your lips, the visible outline of her pussy in her yoga pants. You also catch a glimpse of her yummy caramel skin as her shirt rides up with the stretch. You snap your concentration back to the road to avoid having your now growing hard on from sapping the blood flowing to your brain with a ragging boner.

You proceed with some small talk which avoids any in-depth topics as to avoid Fiona tangenting into something sexual. All you need is to avoid this for a couple hours and you'll be being a nice guy with no harm coming of it. Through the small talk you find out she is dating someone, John, which isn't very surprising though interesting in the fact she hasn't called John to pick her up. You don't pry but, maybe she just wants to catch up or he's busy or something. Throughout the ride to the shop you can't help but pick up on the things you found adorable about Fiona all those years ago. You're happy to catch up and she seems genuinely grateful with you helping her.

You drop off her car and they say it will be about two hours before it is done. This should be well before Sarah gets home so that should avoid any awkwardness. You drop off your bag from the jeweler in the kitchen and lead Fiona to the living room. You ask if she wants refreshments and you get a Merlot for her and a beer for yourself.