"Well, yeah, obviously." He poked at his stomach, sighing at its roundness. Granted, it wasn't really, but he tended to be vaguely insecure about it around all of the incredibly slender people he knew.
Stretching out a little, he toed off his boots. "Well. Cass got here first. I got here maybe - twenty minutes later?" That made him laugh, and he curled up next to his sister. "For a while we just sort of hung out. And um. Eventually we started..." His voice trailed off, his blush betraying what he felt really awkard about telling his sister. "You know."