Hi J.-
I'm writing after you added the "so what happened?" part. My daughters are 15 and 12. Middle school and sophomore in high school. Like you, I had always hoped they would wait until college to "discover" boys. I don't feel that way anymore. My sophomore has her first real boyfriend- only a few weeks so far.
My husband and I had long discussions about how we would handle this new dynamic. Here is what we've come up with. Boyfriend has been invited to a few of our family events- soccer games, BBQ with extended family, etc. She has gone on a group date (movie) with him and 6-8 other friends. We drove one way, his mom drove the other. She has gone to his house once to watch a movie. Before we allowed this, we called his mom and explained our rules for our daughter- no going upstairs, parent home entire time, etc. His mom agreed completely.
We want her to feel comfortable keeping the relationship in the open, as opposed to making excuses to stay late after school and hide behind the gym to make out. By including boyfriend, we are getting to know him and vice-versa. We are able to discuss things we notice with daughter privately afterward and share our perspectives. So far, so good but its only been a couple weeks.
My younger daughter has as many male friends as girlfriends. She is a self-described band nerd and most of the male friends are also in band. She texts the boys often but isn't interested in any of them beyond friendships. She has enjoyed the times we've included older sister's boyfriend and has told me she approves of him.
So far, I like boyfriend and I'm glad this relationship is happening while she still lives at home. Had she been away at college, she and I would have missed out on a lot of the meaningful conversations we've had about what has happened so far in their relationship.
The best advice I received when I was in your shoes was to find ways to include him in the family setting. That way, she gets time with him outside of school and you are there. It also says a lot for the boy if he likes her enough to play by our rules.
Check back with me in a few months and I'll let you know how it turns out.