From Exiled Rebels Scans:
"I've been thinking from the first time I saw you – it seemed like you'd have a big one."

While sitting in the waiting area, the receptionist, Kazama, appeared, full of neutral sexual appeal. "Onii-san, do you like to be bullied?" In fact, Mizushima has trauma regarding SM. He tried to resist but was forced by his ex-girlfriend, and now, he has to try resisting again, but this time against another man?!

Official English on Renta

"When I first laid eyes on you, I bet with myself that you were well-endowed."
Strait-laced office worker Ryota, who is serious to a fault, is forced to accompany his coworkers to a very special club.
As he's waiting nervously, the androgynous and alluring receptionist Sho is the one that comes to his room.
Ryota, traumatized by a past incident, is resistant to the idea of submission, but falls prey to Sho's domineering skills in the bedroom...
Is Ryota just one step away from becoming an obedient puppy!?