I'm currently writing a YA novel, and one of my sublots is a romance between the protagonist (A) and another supporting character (B). I introduce the two to each other early on, and they start out as friends before they are forced to team up with each other later on in the plot. There are a few other major male characters, but she specifically falls in love with B later on in the novel. However, I'm worried that readers will suspect this in the beginning, when A and B meet, and especially when they team up and spend a lot of time around each other.
I'm trying my best to avoid the "instalove" trope that's common in modern YA literature, but I still feel like the romance in my novel is going to be very predictable.