Yay, bonding! Sherlock isn't a psycho (erm, excuse me...a high-functioning sociopath) all the time. But just because he's being civilized and friendly doesn't mean that John fully trusts him...
Also, for American readers who aren't familiar with such things, in a lot of places in Europe (I can cite Spain as one off the top of my head), secondary education-like sophomore through senior year of high school-is referred to as "college", and what we consider college-higher education from 18 and older-is referred to as "university". My friends in Barcelona always confused me when they were talking about going to college at 16. I thought everyone there was brilliant, or they had really high academic standards.
If I'm not correct about this and I have John saying the wrong thing, please let me know so I can fix it and save myself from further embarrassment!
Coffe Snob's Little Brother
"If you only just started working here but have such skills in coffee-making, that means you've been exposed to it before," guessed Sherlock, sitting not at his usual window seat but near the counter. John leaned forward, watching him enjoy the mocha drink.
"You're right," admitted John. "My sister Harriet is a bit of a coffee snob and has made me make her fancy drinks since I was fifteen. That, and I've worked at cafes before to support myself through college. I came to class in the mornings smelling like coffee."
"Must have made you popular."
"I suppose."
Prompt was #42: mocha