The romance is going at a decent pace, the MC is desperate for some love in his life, so he's ready to jump in a relationship in the blink of an eye, while the main boys are all emotionally vulnerable in their own way, (Aiden's daddy issues, Dallan being treated differently by everyone and Tate [redacted for spoilers]), and because the MC gives them exactly what the need in that time, the romance part escalates quicker than normal.
A love story doesn't end after the first kiss.