Sirius knew instantly that he wouldn't be the priority.
He knew it on the first date when you arrived late, explaining to him that you had to go pick up your son from kindergarten.
But he stayed anyway, he knew perfectly well what he was getting into when he started that relationship with you. And that was just another part that he learned to love, and after all how could he not love your son?
Oh, your little Axel.
The boy was practically a ray of sunshine, your whole life, as you had told Sirius on the first date you had, and at first you weren't going to lie that you were unsure about what you were getting yourself into. Sirius wasn't a bad guy, on the contrary he was ideal. But you weren't sure about his lifestyle, the two of you were very different, your life revolved around Axel, your greatest priority, happiness and pride, you had learned to get ahead as a mother even though the two of you were alone. You had a good job, good friends who helped you with Axel and the most perfect child you could ever have.
On the contrary, Sirius' life consisted of going out to party, not having a fixed schedule, the intense flirting that made the girls melt with some soft and teasing words. The pale figure full of tattoos, the sharp cheekbones and that mocking smile that gave you chills every time he gave it to you.
But despite your differences you two had managed to maintain a stable relationship, although that did not save you from the nerves and impulsive thoughts when the day came where Sirius would finally meet your son, but for your peace of mind, everything happened as it should, Axel met your current partner and practically adored him.
And that brought them to this moment, you had put Axel to bed in his room and now the house was in a quiet silence, the sharp features of your lover had softened as the two of you cuddled on the couch.