Unfortunately there was to be no rest for you at home either.
As soon as you entered the door you heard your mother calling from upstairs, and your sister came bounding in clutching a camera, telling you mom's thing finally came. She hurried you upstairs, insisting the camera was for the unboxing as she started filming.
She tell's you it's an ass-mask. A special kind of fetish device for dominant women who enjoy face-sitting and ass-worship. It consisted of three parts, which she showed to you; a super-tight pair of leather panties, fitted to her own exact size, with a large intentional hole in the seat; a super-strong leather belt used to tighten the three parts; and a smaller mask section with an open-face that fitted perfectly into the gap in the back of the panties fitted, of course, specifically for your head.
You gape, wide-eyed, and note your sister is now filming both you and your mother, who smiles warmly and explains clearly to you that she wants to bind your face to her ass-cheeks as a reward for always being such a good son to her. She giggles when you say you wouldn't, and states that she'd make you even if you didn't want to. Her fart this morning, apparently, was laced with something from the same company that made the panties, making the inhaler subservient to the "exhaler.' Your sister giggled at you: you were shaking. Your mom smiled knowingly, saying she knew you were nervous.
She says she'll demonstrate, and tells you to watch her bottom.
You find yourself staring shamefully at those huge hindquarters as your mother simply smiles understandingly at you and bends over. You goggle. Your sister giggles, your reaction caught forever on camera. Chuckling and shaking her head, your mom pulls down her tight black pants and then, grinning mischeviously at you, tugs down her black lace panties in one easy movement. Your sister asks what you are doing for the benefit of the camera, and you say you were staring at your mom's huge ass. They both giggle, and your mom asks if you find it big, soft, sexy? Try as you might it was if you were in a trance, and you nodded your head, yes. She says then well you should kiss it.
Powerless, you feel yourself moving forwards until you were on your knees behind your mom's huge backside. Unable to look away, you stared in awe as she majestically spread her cheeks and asked you to take a sniff. You did so and immediately gagged on the rampant stench, your mom giggling and asking you if it was stinky. This made your sister laugh as she continued filming your degradation. Your mom nodded, smiling, and turned her head forward to give you some privacy as she fluffed up her cheeks slightly and presented them for your lips. Your sister, zooming in now, asks you what you are doing, and you just have time to say you were kissing your mom's big bum because it was so sexy, before your mouth was covered with her buttflesh and your lips pressed against maternal ass-cheek.
Your sister went crazy, saying she'll never let you forget this, but you knew that already. You knew it even more as your body willingly pressed your own lips into your mom's backside, first one cheek then the other, again and again. A teenage boy nervously getting his first real kiss, except it wasn't with some cute girl from his class; it was with the big, warm buttocks of his own smiling mother.
Proudly, she looked down at your little face perched just behind her voluptuous cheeks, and whispered it was time, asking you to please push your face into her butt-crack. Try as you might you were unable to resist and found your face pressing in between your mom's ass-cheeks, taking special care to wedge your nose right up against her asshole. Within seconds your lungs were inundated with the stench of your own mother's bowels, her gently puckering anus matching your inhalations like a separate backdoor respiratory system. You briefly heard your sister break into delighted hysterics, but your mom didn't give you any time to dwell on it, pressing her large, warm cheeks around your trapped face, covering your nose, mouth, cheeks and ears in her buttflesh, blocking out all sound. Looking warmly down at you with a look of complete love in her eyes, she ruffled your hair and told you how very proud she was of her little son.
Your sister asks you something but you miss it, the sound obfuscated by the swell of your mother's bum. You do catch her reply however, reprimanding your sister and saying that you will of course be let out some times. Your mother wiggles her bum teasingly on your face and begins to ask you something. A thought strikes her however, and she pauses.