Did younger one have practice with something smaller first?

On the other hand, if this was losing his virginity then it may be just as well as it'll have saved time getting to where he needed to be, rather than taking a series of cocks, all graded as to size. And his daddy's balls look like they're full of hot cum. He must be bursting to relieve himself by shooting a lot of it out and into the youngster's guts.