In the crotch

You bend over, trying to late to cover your crotch and stop the beam. As it hits you, there is not the pain you expected for having something knocking your nuts. Instead you feel an overwhelming heat, quickly followed by a massive arousal

"Oh f-fuck." you moan feeling your cock hardening and swelling.

You press your hands against it but it's no use, you're now fully hard in front of your sister, and you can feel it growing even longer and larger.

Falling onto your knees, you can't help but fondle it, pawing at your groin like a rutting animal, its sensitivity stronger than you ever knew it. Your pants are getting tight, too tight. You groans and with difficulty, take out your new massive cock.

"Well hello there…" you sister whisper licking her lips.

Your manhood is now 10 inches long, and thick as 3 fingers, your balls are orange-sized, and you feel hornier you have ever been. In a haze, you start jerking off, **** for release, **** to feel your cum soaring through your thick hard shaft.

"I think we're gonna have a lot of fun…" she says in a sultry tone, as she walks toward you.