John swallowed, but leaned in to lick along the bottom of Sherlock's foot. He wanted to please the man. He wanted to please him and do this again. He didn't want to be cast aside.

He shuddered as he moved his tongue higher, licking more. He wanted to show Sherlock what an obedient sub he could be.

He didn't close his eyes, instead choosing to watch Sherlock, unless the man commanded him look away.