MC doesnt deserve Aria...
It's gotta be weird, though; I mean... she changed his diapers, right?
Sure, she doesn't seem to age, and with the possibility of Centuries of life and an adult reincarnation, the concept of age becomes a little ambivalent... but...
He's still not likely to mentally see her as a woman who is within his strike zone, especially at 15.
Now, if he had been 30 or something before reincarnation, well...
OH WAIT
Honestly, I'm still irritated that I have polycythemia, and I haven't gotten my isekai, yet... I just want to turn any item into a magic item and "live freely;" is that too much to ask?
What's a person gotta do to get truck-kun to visit...?
(It's very telling that the Japanese idea of heaven is one where you are allowed to think and act on your own; like "live freely" is basically breakfast in some other countries...)