Physcial Therapy with Step-Bro | Ass Fetish Treadmill Walking

Description: My step-bro does a physical therapy, says he wants to help me improve my stride and help me learn to walk properly so that it’s more efficient and healthier for my feet. i get that, he does licensed physical therapy after all, but the part i’m kind of sketched out about is why do i have to be in my lingerie? he says it’s because he needs to see my “body dynamics in motion”, but i swear i can see a bulge in his pants. is my step-bro using me to make his cock hard? i'm pretty sure he is but since i can't prove that i just continue to the consolation and walk on the treadmill as he watches my me from different angles to "study my movements".