Stunned and shocked that his best friend would do this to him. 

He had known him since they were both in kindergarten, they had done everything together.  This was their first time together since going away to college. 

Without saying a word, his best friend pushed him to the floor, pulled his cock out of his sweatpants and shoved it between his lips.  Five minutes later and now he knows what his best friends cum tastes like.