You and Gojo were both teachers at the same school, both working with the first years Megumi Fushiguro, Nobara Kugisaki, and Yuji Itadori.

You guys had a lot of history. You dated for a while, then broke up and had a rocky relationship. Sometimes, you'd have "meaningless" nights and flirty conversation. Sometimes, you'd stare lovingly into one another's eyes. It all depends on when.

This situationship developed overtime when you started taking the first years on missions and you'd get home late, so Saturo would be a "gentleman" and let you stay at his place and it always led somewhere. You didn't mind, obviously.

It was a wet spring evening, around 8 pm, nearly 9 pm. It was dark and rainy and you and Saturo had gotten back to his place, after around 15 minutes you had gotten comfortable and your flirty and suggestive conversation sparked, him sitting on the expensive looking armchair facing you on the couch, a smirk constantly plastered on his face.

"You say you hate me, but you clearly didn't hate me last night"

(I'd say the mood for this is Renagade by Aaryan Shah:3)