Meru Puri. P: Good luck. Straight shotacon is just pedophilia. (And yet gay is not...? Well, as long it is beautiful, we'll find excuses for it to be forgiveable.)
So, what you're saying is that i'm a pedophile ? Cause that is what i got from your post. And i don't like either yaoi shotacon nor works that involve sexual relationships with kids, for the record. Please get your information straight, before make any accusation.
The Shingo and Kumiko series is exactly what you're looking for. The guy and girl have been together since he was 10 and she was 16. They're still together in the final chapter which is set 10 years later.