Seconds begin to feel like hours while you attempt to hold the seemingly monster poo in your pants. You fidget, and pull out your phone for a distraction. You mom seems not to notice while she stares out of the window. To your amazement after around ten minutes the pressure begins to dissipate, and you tentatively try to release a fart to relieve some of the weight suffocating your tiny weak asshole. Bad mistake. What feels like a train immediately pushes forward, and lodges your sphincter so wide open that it hurts.
"Darling do you mind if I smoke?" your mom asks casually, while smoothly lighting one anyway. Your tight trousers hold it in place as you come to terms with your two inch thick turtle neck. Panicking, you turn to your mom wide-eyed and lift your muscular ass off the seat
"Mommy--" is all you manage before your tight trousers tent downwards and stretch to make room for a few inches of this thick, solid poo. It plugs again, but the pressure in your anus is only building.
Your mom turns to you and after observing your beautiful wide eyed face, with your jaw slightly dropped and your bum hovering above your seat she immediately understands.
"Oh my baby, just let it all out" she sighs, making direct eye contact
"Biut momm--" you stutter as she interrupts you "just look baby, mommy will show you" she says in a soothing voice as she hoists her own arse above her seat, using the steering wheel and your headrest as leverage. What follows next completely shocks you-- you see the concentration in her face even though she does not move a muscle. This continues for several seconds before she lets out a quiet "uhhhh" and a loud crackling starts coming from her buttocks. she continues to look you in the eye, and give you a slight smile as she blows some smoke out of the corner of her mouth. The wet crackling continues, punctuated by occasional bubbles and farts, before a heinous smell hits you in the face. She then sits back down, takes another drag of her cigarette, and lets out a louder "UH" while tensing her body up. A final "ppfffttwbwbpbpbpbpbpb" emerges from her seat. She continues to look you in the eyes while she proceeds to rub her ass around a little to make herself comfortable. She has another drag, blows away the smoke, smile and reaches out to hold your hand. This comforts you. You look into your mommy's eyes and they see right through you, she says "Now you baby, let it all out for mommy, its OK". You feel your eyes become a little teary, but you are happy as you fully let go. The monster log creeps out by millimeters. You relax your shoulders and push, you push you anus as hard as you can and the thick as fuck solid shit plug now moves rapidly, extending another three or four inches before, like turning on a tap, you feel runny yet viscous shit stream out of your ass, the smell is horrific but you dont have a care in the world. It flows freely from your overstretched anus of around 10 seconds. The relief, the warmth, the feeling is incredible.
Your mommy lets go of your hand, and asks you