Alex wants Kevin to give him his legs, feet, soles to play with.
Kevin won't say no. Alex in his underwear (and then without it) will first lick Kevin's sneakers. He will then taste the socks. Gradually getting to the coveted bare feet.
In every scene, he will enjoy the way Kevin lets him play with his legs.
The happy ending will be hands free when Kevin jerks off Alex with just feet and he cums on his stomach!