Read the body language on this. Awkward. The bottom wanted to kiss afterwards and the top didn't. Top spread his legs several time when the bottom was licking his balls because he wanted his ass eaten. Some guys do that when they want to be topped, too.
I used to have a buddy who would suck my balls hard. He would suck them and slowly pull away while they were vacuumed in his mouth until each one physically and audibly popped out of his mouth. The feeling was so painfully good and intense. I miss that man, he made me cum at least one time just by sucking on my nuts..