"I was thinking that you can join Emily in there." You say as you start stroking your shaft gently, watching your cock twitch.

Alex eyes your cock. She thinks for a moment before nodding.

You can't help but smirk. "Good girl, get on the bed."

Alex listens and gets on the bed. Not long after you gently grasp her feet and guide them to the tip of your cock. Not long after you feel your cock start to slurp down Alex's legs. You hear her gasp as she's pulled in and you can see her bite her lower lip and she slowly rubbed her clit.

You watch and moan as you feel Alex slowly slide down your shaft and join Emily in your balls. You moan as you feel her hips and first hand on her clit go in, followed by her breasts and other hand that was rubbing her breasts.

"This feels... really good." Alex says right before her head slides into your shaft. You moan and lay on Alex's bed as you let yourself adjust.

"Hey Alex." You hear Emily say in a sultry tone before you can feel movement in your balls.

You hear Alex moan and respond teasingly. "Not even five seconds and you're already covering me in cum? You really are a pervert, Emily."

Emily giggles in response. "Well, we are in a ball sack after all. It's to be expected."

(Well, the two of them are having fun in your testicles. What shall you do with your two sisters?)