Sirius watched Remus, confused at first and then.. more confused. He held back the urge to interrupt him several times, just letting him get it all out. "I.. um." He had thought that it was all some crazy thing in Emily's brain. That she hadn't been able to get over the idea that Moony and Padfoot had slept together during the moon, and she was trying to create solutions for problems that weren't there.
But Moony loved him in the other way. "Uh. I haven't really been thinking about it." That's not to say he hated the idea. He had just filed it away as a one-time thing.