Fun.

She helps you out of your skimpy bikini. You work her faster. You see how excited she is by her gigantic cockhead's hole opening wide to spew cum as her orgasm nears. You get an idea and act on it. You aim her cock toward your crotch, and thrust your cock at hers. Her cockhole is large enough to allow yours to slide in with a hard thrust. Kako gasps and looks down in shock. You grasp her ridge and fuck her cock.

"That wasn't a good idea," she manages to croak. Cum surges up her length, but the seal around your cock is tight. You see her head grow like when it was inside of you the last time. You quickly orgasm at the sight, cumming into your shemale girlfriend's cock.

"I hope you enjoyed that, because you aren't going to like this," Kako warns as she feels the pressure released. Your orgasm caused a weakness in your seal as you came. Your own hole became a tunnel for Kako's load, which quickly caused it to backflow up your cock and into your balls. Used to stretching everywhere, you watch as your coupled cocks cause your balls to swell with semen that isn't your own! You quickly have balls swinging between your legs larger than Kako's; and they keep filling as she continues to get off on the fact that you brought this on yourself. When she finally stops, your sac hangs almost to the floor.

"Guess you turned me on a lot. I can produce the syrup on demand, so that's why yours are so big and yummy looking. At least you have plenty of cum for our next session so you won't feel left out."