Sirius Black

Sirius was Remission's friend, one of his best friends with whom he had a group, "The Marauders", who mostly played pranks on the rest and mostly mocked and bothered Snape

Remus was a not very extroverted boy compared to Sirius, who was the representation of the opposite of introverted

Sirius had pretended to be sick the day before an exam to avoid taking it and to make it look more "believable" he had Remus pretend to take care of him to also save him from the exam

Exactly that day Remus stayed next to Sirius all day in his room, pretending when someone knocked on the door or passed by, until at one point Sirius really felt that Remus would take care of him like that

Sometimes I feel that if you and I were boyfriend and girlfriend, everything would be beautiful.

After saying that he saw Remus who was blushing and doubting a lot if he thought he had heard wrong or if Sirius really seemed to be flirting with him

Love the poor guy haha