Regarding surnames, I don't think I've ever asked a girl her last name until it was necessary. In school, college (uni for me) or at work, you might catch someone's surname from a role call or obviously from email or a business card, but worst case, some girls I didn't find out their surnames until I met their parents. It's not like we live in an incestuous world where we've got to be on the lookout in case we fuck a long lost sister or something.
So in this game, I'd expect the mc to have already seen (but not given a shit about) the surnames of students in his class, and that's about it.
I don't buy it that just because
we don't know his mom's surname, he doesn't either. But regarding Sage, they don't share classes, so there's no reason to know her surname.
You just don't go running around asking hot girls for their business cards.
And the only time I started seriously typing women's full names into my phone was when I got married.
"Candice Smith (florist)"
Looks a lot less suspicious on your phone than:
"Candy"
Mrs Shazba: "Hey Fuckface, who's this 'Candy' on your phone?
![Mad :mad: :mad:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
"
Shazba: "Umm, err, would you believe she's the new mechanic?
![Whistling :whistle: :whistle:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
"
Mrs Shazba: "Oh, ok."
Shazba: "
![Sneaky :sneaky: :sneaky:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
"
Yeah, he lives in Sweden.