Nice start, Cami! The first installment is obviously short, but it goes a long way towards setting the scene and the tone of the piece. Here are a few of my thoughts:
1. "He had even managed to harvest a thin, but distinguished mustache, which he wore with great pride." I'd change "harvest" to "cultivate" - I think you really meant the idea of cultivate (ie. grow) as opposed to harvest (ie. reap) anyway. I really like the whole imagery of it, though. It's just a subtle indication of time gone by that helps introduce the story. Very imaginative!
2. Speaking of Rickie, I think you nailed his character. ""You look beautiful," Rickie mused, as he took Rayanne's hand and spun her in a full circle, then stepped back to admire her." I loved the spinning part. . .it's so like Rickie! Also classic Rickie: "I'd always imagined aqua," agreed Rickie, smirking.
3. Does Markups Department store exist (in real life or in the series) or did you make that name up? What a terrible name for a store! If you made it up, consider changing it to "Markdowns". Who would shop at a store that blatantly advertises that they mark up their prices? If it is actually a real store, please consider writing to its CEO with my suggested change.
4. "Rayanne busied herself with a loose thread on the hem of her dress, then looked up quickly." Nice little touch. Attention to this little kind of detail helped make the show work so well and you've continued with that nicely.
5. The final lines:
"Patty took me to the doctor yesterday." Rayanne grinned.
Brian focused on the road, a smile peeking out from the corner of his lips.
I'm not sure why Brian would be smiling here after being so obviously nervous about Rayanne's pregnancy, although I'm sure it'll be explained in further installments! The only thing I can think of is that he is smiling at the reference to Angela's family and he really hasn't gotten over her yet. We'll see. . .
6. There are a couple of places where I think you have an extra comma or a misplaced comma. For example: Rickie had grown taller since sophomore year, and if possible, more gangly. He had even managed to harvest a thin, but distinguished mustache, which he wore with great pride.
I'd change it to: Rickie had grown taller since sophomore year and, if possible, more gangly. He had even managed to harvest (cultivate!) a thin, but distinguished, mustache which he wore with great pride.
There are little things that just clean up the clauses and helps the text to flow.
7. Overall, great job! There are so many questions to be answered by the subsequent installments that you're sure to keep people coming back. I'm looking forward to reading more!