New stuff

My boyfriend had been asking if he could cum in my mouth since the first time I sucked him. I finally let him yesterday and at first it wasn't so bad but then I could taste it and I nearly vomited. I rarely make any kind of noise so when I heard myself gag I felt bad cause I didn't want him to feel bad about it. Is there a way to change a man taste? If so i think I could put up with it.