Roughly

You take a firm grip of Bee´s hips and keep pushing. He squirms beneath you and his breathing grows haggard.
"Oh godfuckitshugeohfuck!"

After getting in about 10 inches you feel a stop. No matter how you press, this must be Bee´s limit. Bee seems relieved when you start to pull out. But just as there´s only an inch left inside, you ram your cock back in. Bee´s yelps in pain and in a small but growing part, in pleasure.

As you continute pounding him his pleas for you to stop cease, instead he merely grunts, pants and moans in pleasure. You feel that tingling sensation in your balls and somehow Bee must feel it too.

So the quesiton is... Where do you cum?