I guess it would be fair but you can't hit my balls.

"Oh wow! You'd do that for me?" she said "I thought I'd have to beg. You must be real sorry. But how can I make sure I don't hit your balls? I can see that you're hard so I'm pretty sure I know where it is."

As she points at your erect dick, you take her hand and set the pointer finger on the buldge, showing her the target. "Go ahead. Side to side and you'll be fine."

" Really? Thanks! Somehow this does make my girl parts feel better." She takes her hand, presses slightly down on the top of the dick and feels the push back from the hard on. Then, she slaps your dick through the pants on the left side. Not fierce, like in anger, but playful. The dick bounces off your thigh and briefly lands in her hand as she slowly withdraws, fingers tracing and enjoying pulling away.

"Well... i guess that makes us even then. But I'm kind of having a great time. Did I hurt it?"