Does it hurt a guy when someone sucks on his balls after getting hurt? 😅

So, my bf & his friend mess around a lot. Last week, my bf’s friend dropped a bong on top of his private parts while he was sleeping. The next day, I was at my bf’s house & things got heated quick (if you know what I mean 😂). I went down on him & wanted to experiment so I moved my mouth towards his 🏀s to suck on them but he immediately flinched & moved my head back on his dick 🙃. Not sure if it’s cause he doesn’t like it or it hurt but I was too in the moment to ask & forgot later on lol. Wouldn’t it hurt his dick too tho if it hurt his balls? I mean, he was working that thing good so I’m confused as to why only his balls would hurt IF that was the case 😕