The Experiment - Part 3 - 6 (Patreon)

"I thought so," I grinned. I kneeled down in front of him and rubbed my own cock over the muscles of his arms and chest and torso, feeling the strong shapes taut with exertion and trembling slightly. I teased his nipples some more as I did this, eliciting more groans and moans from my soon-to-be-sculptural subject.