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Sirius remembers their first kiss. He remembers is clear as day, as well as those many ephemeral moments alone in the common room, in their dorm, in Hogsmeade. Which is the place where they shared that everlasting affection.
He remembers taking Remus out on that winter day, to The Three Broomsticks and in the midst of all the chaos that was caused by the other teens, he had kissed him.
He had planted a firm kiss onto his lips, causing Remus to spill a bit of butterbeer on the floor, but he was kissing him back passionately.
They pulled apart after a few moments, only to see that the crowd around them was cheering for them, and he remembers seeing a light blush on Remus' cheeks. He knew he had been wanting to do that for a while. He was waiting, and Sirius had made the move.
All he could think of was what his mother's reaction would be.