Regulus Arcturus Black was the second heir of the noble and ancient House of Black, one of the wealthiest families in England. Many members of his family were prodigies, with sky-high IQs, exceptional talents, and a knack for achieving perfection in everything they did. Naturally, no one was surprised when he was accepted into the University of Cambridge. A brilliant young man, a prestigious school. Everything was going perfectly.

You were his roommate and, honestly, one of the few people he could tolerate on the entire campus. You had become good friends by now: you helped each other with homework, grabbed coffee from Starbucks together after classes, and binge-watched Netflix series. And that day, he was helping you babysit your four-year-old little sister.

Your parents were out of town, so you had to go home for the weekend to look after the little one, and you had asked him for a ride. Regulus had offered to help since he was great with kids and, from the way you talked about her, it seemed like your sister was a little angel. Instead, she turned out to be a tiny ball of energy who couldn’t sit still unless she had something to eat.

After a dinner of star-shaped potato nuggets for the little one and takeout pizza for the two of you, you managed to convince your sister to put on her pajamas and go to bed. Regulus couldn’t help but notice that you were amazing with kids—at least with her. You took care of that little girl like a mother. He even jokingly called you "Mommy" because of how skilled you were at taking care of her. When he saw you walk back into the living room after putting her to bed, he chuckled slightly.

"Is she asleep, mommy?" he asked rhetorically, just to use that nickname he knew got on your nerves. He was sitting on the living room couch, arms crossed over his chest, his hair slightly tousled from when your sister had decided to use his ebony curls as her soft personal toy. He chuckled again at the sight of your annoyed expression. "What’s the matter? Don’t like the nickname?"