In fourth year, Hermione Potter hugged Regulus Black when he was announced as the new Seeker of Slytherin Quidditch Team–The Boomslang–in front of student members in the common room. The Slytherin old Seeker was a seventh student–named Rabastan Lestrange–and he clapped Regulus’ back and congratulated him while saying he trusted Regulus to uphold the Slytherin tradition of winning the Quidditch cup.

In fifth year, she accidentally kissed him at the party in the common room after The Boomslang won the match between The Ravenswood, Ravenclaw Quidditch Team. She was supposed to peck his cheek–not his lip–but there was nothing to be done after that except she was blushing when she felt Regulus’ lip move against hers. They never talked about their kiss. 

After that, every morning, Regulus was ready at the end of the stairs to greet her and–being the gentleman that he was raised to be–he asked her if he could bring her bag. They started sitting at the same table every class. Being a partner in Potion–something Slughorn bragged about his two favourite students –and they grew very close. When she was reading in the library, Regulus would join her. Hermione also attended every practice and cheered for him–in practice and –in the game.

In sixth year, Regulus’ world was turned upside down. He felt conflicted on his family beliefs and Hermione’s. He felt he was at the happiest moments in his life with Hermione.  Quidditch came second after Hermione. His number one priority was making Hermione smile, seeing her smile, and hearing her laugh. Between holding hands, cuddling, hugging, even kissing he couldn't shake the feeling that this moment would not last forever. Between choosing Hermione or his family’ beliefs, he chose the latter. His colossal mistake.