Kel has seen his share of weird throughout his life, but when London asks him to sub for her and her boyfriend, that tops the list. He isn't gay. He isn't bi. He definitely isn't submissive. And with an underlying case of post-traumatic stress disorder from years in the military, anything BDSM just sounds dangerous.
But he also doesn't want to see his friends hurt, and he's positive that will happen if they get together with strangers from the Internet. London plays things too close to the vest for him to get a good enough read on her, but Kel trusts Ty, even if he doesn't think he'll enjoy turning over control. It'll be a one-off, it'll be a little weird, and they'll all go back to normal.
He's not sure what to do when a little weird turns out to be something he wants.