She pulls the curtain back

Becka pulls the curtain back, "Meg are you .... okay?" As Becka comes into view with a concerned look on her face, I'm mid thrust and I'm close to cumming. I quickly see that Becka is topless. I'm staring at her beautiful full breasts as I bottom out in my wife's quivering cunt. It's all too intense and I begin to cum.

It's apparently too much for Meg too, "Becka! Oh my God!," she shrieks out in embarrassment as she jumps forward off my cock, wrapping herself in the shower curtain, trying to hide. Which of course leaves me standing there naked with several ropes of cum shooting out of my pulsing rod. Almost in slow motion I see cum shoot out of cock and splash across Becka's tits. As the first stream of jizz hits her skin Becka's nipples begin to crinkle up and harden.

I see a brief flush cross Becka's chest as she stands their gaping at me for a second before she regains her composure and says, "Well, it looks like you were both more than okay." She drags her eyes along the length of my rod before she locks eyes with me and smiles. "Much more than okay," she says before biting her lip and shifting her legs.

Meg apparently still shocked and embarrassed grabs a towel, and hastily retreats from the room muttering something about being late and having to go.

I'm left naked and alone in the bathroom with my half-naked sister who still has my cum painted across her chest.