Mom comes in!

In the middle of being anally ravaged by your older sister, the door flies open, and the three of you freeze. The tip of Crystal's cock is pressed right at your prostate, while Sarah was in the process of maybe giving you a handjob. Her hand is only a few inches away, and you were looking forward to feeling her dainty fingers wrap around your neglected member.

"What is all that noise!?" Someone demands to know. Sarah pulls her hand back. Crap.

It's your mother Lisa, standing in the doorway and staring at the scene before her. Yes, you realise, the whole family is here now, watching you get used like a cumdumpster. You were already naked, but now you feel naked. The semi-erect, younger sister cock hanging over your significantly smaller, fully-erect boy cock isn't helping.

"Doug? Is that you, making that strange sound?"

While still looking at her mom, Crystal plunges deep into your asshole again. You squeal involuntarily.

"It IS you!"

She still hasn't commented on what her daughters are doing, which is worrying to say the least. "I... I felt a twitch in my dick every time I heard it," Oh no, "but couldn't put my finger on what it was."

Oh no. "Can you do that again, Crystal?"

She does, you squeal. Then she does it again, you squeal again. There's a really big bulge growing under your mother's skirt...

"We were just turning him into our cocksleeve, mom. Wanna join?" Sarah asks, with her innocent, well-meaning smile.

Mom hesitates to answer, instead sitting down on your desk chair to watch for a while as her daughters are eagerly fucking her son. The tent in her skirt remains.

After maybe ten minutes, she has made a decision and comes up to the three of you.