Tony as a competent TA

[marsmaywander.livejournal.com]

age-old story. passed over a fic in AO3, then hours later i want to read it and can't find it. i remember that either the summary or the bookmarker's comments were talking about how many of the college!au tropes had tony as an impatient jerk of a TA who talked over the heads of his students, but that they wanted to see tony as a highly effective TA that taught people well (since you have to know the subject really well in order to teach it properly).

so basically, looking for a fic with tony as a TA who's good at teaching (or recs, if i can't get the exact fic). ringing any bells? super appreciated!

edit:
FOUND! The Chemistry of Love by inukagome15