The Collared Omega (слэш)

Severus is an omega, collared by a Potion Master alpha who sees him as nothing more than sexual relief and free labour. But he longs for an alpha who will care for him, give him his biggest desire of a baby.
Lord Harold Potter is an alpha, mateless he is searching for an omega to be his life partner.
Lucius is an freshly inherited omega, wanting more than just to be a breeding omega, but consigned to his role in society.
Shopping for ingredients Harry finds Severus, he is mesmerised by the omega, whose scent calls to him. But he is collared, owned by another, despite this Harry wants to learn more, have Severus, hold him, take him as his mate. Meanwhile his father is throwing unmated omegas at him, hoping he picks one to be his mate.
 
Can Harry have the omega he has been waiting for?
Can Severus have the alpha he has been dreaming of?
Can Lucius have the life he hopes for?
Severus is 26
Harry is 27
Lucius is 17
Non-con is between Severus and his Alpha (not SS and HP.) Also a non con with Lucius and another character - The noncon is not detailed, but it is in the fic)