I don't think Noah's Charm Ability is having any impact upon Makoto.
Rather, it's her natural charm that is proving effective.
"Charm" is imposed from without.
'charm' is part of how you really are.
While Noah's Charm has no effect on Makoto, he finds her charming.
They get along, you know?
Makoto.
Sasa doesn't have a home in this world.
So saying you are happy to be able to go home together with her...
You saying that your home is her home as well?
You lady killer you.
We do need to bear in mind that Sasa did make herself at home at Makoto's back in Japan, so Makoto not thinking deeply about his wording is par for the course.
She was one of the few he considered a friend rather than an acquaintance.
Along those lines, consider who he does think of as friends among his classmates.
Fujiwara. [Rising Merchant Prince]
Sakurai. [The Hero of Light.]
Sasa. [The Lamia Queen.]
It's a rather select group...
If one starts adding in those he looks at that way from their new world?
It's pretty impressive for someone who all the Sacred Deities representatives considered total trash upon his arrival.