It’s a short story like 5-10 chapters, about re-united ex lovers who meet again 10 years after high school. Blonde seme x dark haired uke. In high school the blonde guy took on a bet to date the dark haired guy, and when the latter found out (despite blonde falling for him!) they broke up on bad terms. They meet bc blondie is contracted to work for the dark haired guy then begin dating again even though blondie knows dark haired guy is doing this as a petty attempt for revenge.