He had reached a point where it was now pointless to deny that Boyd intrigued him. Everything from his unexpected behavior to the surprising pleasantness of his face being brightened by a smile. Sin couldn't remember the last time anyone had graced him with that expression and it had struck him at the time. But that still didn't give him any more insight into whether this was all an act or not.
Shoot me but more recent pictures of Boyd fit better for me.