Sherlock pulled his fingers back out. He looked into John's eyes. "This is going to hurt." There was no reason to lie to him.

He created more lubrication and slathered it on his cock, laying it on thickly. He took hold of his cock, his other hand on John's thigh to hold him tight

"Hold onto something..." Sherlock growled as he started to push in, with quite a bit of resistance.