She kisses the tip of the cock, and a little bit of pre seeps out. She tastes it, and gives a devilish little smile. She then pushes her head into the hole. To your amazement it actually works and her whole head is engulfed.
Thunder lifts his head high and neighs loudly upon her entry. You see Evelyn push into the ground and force her shoulders into the tip.
You can see even more precum start to drip as Thunder is enjoying this. He gives a hump and forces your sister in up to her waist.
There's a very noticeable bulge in his cock in the shape of your sister. You realize you have a massive hard on watching this happen. Without thinking you start to lightly jack off. After a minute it seems like Thunder has stopped or is having trouble, you're not sure which. You stop jacking off and decide to go behind your sister, hesitantly put your hands on her ass, and push. It works as she goes deeper in and you back up before you risk getting trapped with your sister.
Your hands get covered in cum though, so you wipe it off best you can on the hay and dirt. When you look back all you see is your sister's feet. They quickly get sucked up and you watch the bulge travel up the cock and into his sack.
You see that one of his balls gets enormous as your sister enters it. Soft moans can be heard coming from it. You go up to it and softly press your hands and ear to it, listening to you sister.
You feel her moving around a little bit, while constant soft moans come from her. You realize she's masturbating inside. You hear one final moan, louder than the rest, as she cums hard.
