After he licks and worships our sweaty armpits from an intense cycling training ( see Sweaty armpits licking ) is the time to give him our smelly feet from sneakers.
He must smell and inhale the pungent smell, and we will him to suck all the sweat by gagging him with our feet!
We have fun and at same time, our feet gets massaged by his tongue! Its an win win situation, for us, of-course!
As for him, he is grateful for having the occasion to sniffs and worships our sweaty feet in socks!