Not Really omega verse, more like their pheromones attract each other
Chapt 1: seme is a food distrubor at a company that uke works at. They had a go at it in the bathroom.
Chapt 2: two students. Seme has dark bangs and is an otaku who likes uke(who sleeps around) because uke resembles an anime girl...then rape for a long ass time in the nurse's office.
Drugless Sex