My bad I just checked and they're 5 years appart actually .
I would say that it would be weirder if this age gap (15-10) would date if they actually met for the first time at this age but for them they knew each other when they were younger children ( from him being 12 and her 7) so it feels more normal to see them have that connection of falling in love with each other.
I do sometimes think that it's weird but I think it's something also normal. It would be something different if for example a 15y old would fall in love first sight to a 10y old . That screams a big no.
They're side would almost be like childhood friends with an age gap, the older one having feelings from when they were young
I'm not trying to be mean or anything. Sorry if it sounds, but I do get at what your trying to get. However in this situation I don't think it's that big of a deal to call it paedophilia. They are still technically children.
I still hate the pedophilic undertone like bruh she is like 10 and u are like 17 at least wait until she is an adult to kiss , fucking pedo