Get some David Archy boxer briefs. They have these special compartments: one to stick your dick in, and another to cradle your balls. https://www.amazon.com/David-Archy-Underwear-Separate-Pouches/dp/B00ENTH0N4
David Archy has some comfort breifs. Got a little pouch for your boys and an extra little slot for the dude. Super comfortable, I wear them all the time.
https://www.amazon.com/David-Archy-Underwear-Separate-Pouches/dp/B00ENTH0N4
For just a couple bucks more you can get the version with the dong sleeve.
https://www.amazon.com/David-Archy-Underwear-Separate-Pouches/dp/B00ENTH0N4?th=1&psc=1
These guys have separate pouches for penis and balls. Revolutionary!
http://www.amazon.com/David-Archy-Micro-Separate-Trunks/dp/B00ENTH0N4/ref=cts_ap_1_fbt