The Secret Relationship Spread


I received a PM asking
"friend, is secretly dating a boy, who happens to be other than white (go figure?), and her parents have no idea they are still dating, and no intention of letting them still see one another, for rather predjudiced reasons. I told her to ask you for a spread"
She also mentioned
she wants the relationship to grow, but at the same time wants to keep the secrecy, and the "fooling around" mentality, they have been together for over two years now, and she really needs some help

I wasn't sure exactly what she wanted to get out of this, but I was running behind and decided to just give it a go.

1- How can it grow
2- What is blocking it
3- Pros of keeping it secret
4- Cons of keeping it secret
5-7- Advice for ease of relationship