Yamaji has decided that she and Koike make a fine couple (with good sexual chemistry), and so they ought to get married. Why wait? An extended engagement or dating period wouldn't appeal to a cool, no-nonsense type like Yamaji. And Koike clearly doesn't seem to mind the thought of marrying Yamaji. They'll be fine.
Really loved this. Yamaji is incredibly cute and quirky while Koike actually acts like a good guy who's concerned/cares about her. Kinda hate that it's something notable, but what can you do with how some of these main guys are written in vanilla these days?
Yamaji has decided that she and Koike make a fine couple (with good sexual chemistry), and so they ought to get married. Why wait? An extended engagement or dating period wouldn't appeal to a cool, no-nonsense type like Yamaji.  And Koike clearly doesn't seem to mind the thought of marrying Yamaji. They'll be fine.
"I REALLY shouldn't sniff this"? Self control...Interesting. Well hey, randomly putting your things into his locker is certainly one way to get him to talk to you. Apparently it was meant to show her affection for him, possibly by letting him smell them?
At least he's honest. When she asked if he wanted sex he just replied "Uhh, yeah."
Great ending though, Heh, she just straight up told everyone that they were getting married. Well I imagine he had planned to take responsibility anyway, but now that everyone expects the engagement, I guess he needs to start working on those invitations.
If you remember the doujin "My Teacher" by the same artist, the girl sent naughty pics to her teacher, sneaked into his duty room, gingerly handed him a condom and said that she wanted his baby. She alrd knew how much would get a man to have sex with her, even if he is over 15 years her age.
I think Yamaji is more of a kuudere---a cool, self-possessed type who has made a perfectly rational decision: she and Koike make a great couple, and so they ought to get married. They certainly have great sexual chemistry. And Koike clearly doesn't seem to mind the thought of marrying Yamaji.
Koike-kun proved himself to be A Man Of Culture by falling for an older woman, and Yamaji-san, despite her (a-hem) 'little quirks' just might prove to be top-notch wife material. And a young adult who's still a virgin is a rare thing to see.
Her: you're wifing me now bitch boy