Nah, thanks!

You don't really think that this is such a good idea, since you don't know about this stranger's hygiene.

"Sorry man, but handjob was the deal", you say, and hear a disappointed sigh from the other side of the wall.

"Yeah right, no problem, just keep going!"

You increase your pace and feel the dick getting bigger and veinier in your hand. It's close to cumming!