Searching for a manga

Ok so this manga which I have been reading for a while had been lost somewhere and I don't remember the name. I would be really grateful if you could look into this for me. The plot is very interesting. It's a bl and this the world where omega and alpha isn't present and it's isn't known but suddenly two school mates started behaving differently. The bottom doesn't know he is an omega as they are the first Gen of the omegaverse and they don't even know what this all is. The top is the studious kid who is very interested in science and technology, their class playing in yhe ground and when everyone left, the leads remained as they were given the chore to clean the ground but suddenly the sweet smell of something started coming from the bottom and top went into the daze. The bottom was hyperventilating and he felt feverish so when top was gonna call for someone, smth happened and they both started having sex but the top was skeptical about it but the bottom was insisting that this isn't sex its masturbating and for his entire hear cycle the bottom remained in the store room of something and that too in the school and top would bring the necessities and would provide relied to the itch the bottom has. The last chapter I read was when suddenly top finds out bottom had a gf and his alpha instincts came out and ig he marked him which I am not too sure about but that was it. Please can someone help me with finding this