Can you change the saddle?
I had the same issue with my echelon bike. Bought a padded saddle cover & padded shorts from Amazon. Combo of the 2 did the trick, boys have been happy ever since.
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As someone who cycles for 4-8 hours a day in the summer, there are many saddle shapes and designs and I found getting higher end ones actually helps the most over the cheapo saddles out there.
I like Specialized saddles and I generally change the angle to point the nose down quite a bit versus parallel to the floor.
It’s usually not the saddle but your position on the bike
I’m gonna support this too. You should look at getting a bike fit done asap to get your whole (hole?) positioning figured out. And stop wearing shorts 3 sizes too small cos that’ll also squish the boys - they gotta have some room to move.