It didn't take Spock long to discover what Jim's feelings for him were. Spock had read a lot of books and papers on human sexuality and attraction and right now as Jim sat in the captain's chair and stared at him with a dumb look on his face, he knew exactly what was happening.
Spock had a fascination with human sexuality and he surprised himself when he thought he wouldn't mind seeing what would happen between them. Spock had never been with another man before and something about thinking of Jim as his first male lover made him wildly blush.