Not a massive fan of the Jonas Brothers but always enjoy a good fanfic.
This is a really cute story, maybe went a bit too fast for my taste or I just like things a bit slower than usual. Your writing is good, a few grammatic errors in some places (but hey, we all make mistakes), might benefit from separating your paragraphs and I noticed one or two big paragaphs (you don't wanna make them too long), fairly well descriptions and you explain well.
I'm typically a fan of Jonas Brother Fanfics. You seem to have some writing skills but there could definitely be some more actions mixed into the writing, it seems to mostly be dialog and though dialog is rather important, so is the details of what the characters are doing, and what their surroundings look like. Keep it up!