Sirius and James had been sleeping together for several months before Sirius rolled over one day and asked his companion just what the hell they were doing. James blinked his gummy eyes and sat up hazily. He didn't know what to say. What did Sirius want him to say? Why was Sirius suddenly asking all these questions? He certainly hadn't been asking them last night. Or the night before. In panic, James rose from the bed in the pretence of making tea. We'll talk when I get back, Padfoot. Just need a bit of caffeine in me.
Standing naked in the kitchen, James's mind began to race. Oh God. Oh God. Does he want to get serious? Does he want us to make some kind of announcement? James couldn't imagine it. He wasn't ready. He was young, he wanted to play the field. Sirius was demanding too much of him. Commitment today, 'moving in' tomorrow, mortgage the day after. Sirius would want children. They would have to go to the adoption agency, and James would have to be all sensitive and caring and responsible. Unless they didn't go to the adoption agency at all. James wondered how Lily would react if he asked her to bear a child for him and Sirius. He'd have to be careful about it, of course. He'd have to sit her down and have some chocolate on hand. Explain to her she could visit on weekends, but obviously they'd have to work around some sort of schedule. But what if Sirius didn't want Lily as the mother? What if he wanted the child to be a Black? James would have to-
Stampeding back to the bedroom, red in the face, absent of tea, he yelled from the doorway "No I will not have sex with Bellatrix, you sick freak!"
And that was the end of any conversations about commitment between Sirius and James.