Cute! Have you ever felt unsatisfied by the two pages of "this is how I fell in love with my crush way back when" flashback in a high school BL? This takes that concept and builds it into an entire volume. I can't wait for the sequels to be translated, if the scanlators are planning on it! I hope the older guy is still taller than him. For laughs
That being said, I guess the reason why they don't expound on the flashback is cause I remember being 11/13 and thinking that 13/11 year olds were basically a different species. They really do look like a kid who just graduated Elementary school and a kid who's about to enter high school (or well as close as you can get in animanga). Which is appropriate and really will show the passage of time, but I'm like "Dang, I would never"