I got confused a little on why he called his classmate "sensei" at the start, but the sequence is like this:
Pages 2 and 3's first half are flashbacks marked with black borders (given that he thinks she has dating experience, he asks her to become his "teacher" on how to deal with random girls that he's passively but unintentionally rizzing with pheromones) which then leads back to page 1, then second half of page 3.
I guess it's a "fake/trial" relationship kind of deal where she teaches him how to handle girls for when he actually falls in love with somebody, but it's not so clear to me whether she's telling the truth about wanting to love him for real at the end, or was it part of her playful teasing "lessons". The final panel is where I'm having trouble telling who said what because it seems like both of them are holding back from each other.
Kind of a headscratcher and too short, but it's fine I guess.
Edit: noticed a few things
Page 3 second half: It's probably better to replace "barefoot" with "bare legged" (TL feedback)
Last page: her stockings suddenly disappeared... I have questions...