Yesterday, I made up a song for DS2:

You gotta swallow your spit (swallooooooooooooooow your spit)
You gotta swallow your spit (swallooooooooooooooow your spit)
Swallow, swallow, swallow, swallow,
You gotta swallow your spiiiiiiiiiiiiiiiiiiiiiiiiiit!

DS1 takes considerable pleasure singing it.

DS2 takes considerable pleasure hearing it being sung for him.

There was noticeably less drool today.

Huzzah!