Aunt Mel has you figuratively by the balls and you know from experience that if you don't behave they'll be literal. Probably best to submit.

"S-sorry Aunty..."

"Oh sweetie" she says softly, stroking your face with the back of her hand "you know I don't accept verbal apologies." She marches you over to her bench press and tells you to lay down on the bench "now you're going to be a good little ass cushion for me while I do my workout ok?"

You lay there waiting for her to sit down as Mel racks her weights but instead a slap cracks across your face

Her tone gets a little colder "When I ask you a question I expect an answer sweetie."

Your face is pink from the impact and the stinging sensation has caused you to tear up a little "Y-yes Aunty... I'll be a good cushion for you."

She beams brightly "good boy!" Without another word she sits her yoga pants covered ass on your face and starts to to bench 405 like it's nothing.

At first it's not too bad, for an older futa your aunt has a fantastic ass, soft and bouncy and from her scent she probably took a shower just before coming into the gym. But what niceness there is is counted by the crushing weight of Mel sitting fully on your face and the fact you are completely smothered in this position.

Mel's meaty ass makes it near impossible to take a breath and she is far to heavy to push off so after two minutes of being pinned under your aunt you start to panic, tapping softly at her thighs

"Hmm? You need something sweetie?" She asks innocently

You tap again, a little harder this time to show you really need some air

"Darling you need to stop that now." Her tone matronly "you're distracting me."

Your lungs are screaming at you now, they need air. Your tapping become frantic as you squirm trying to just get an inch, a crack of breathing space.

"Oh what is it now?!" Mel racks her weight and gets off you "what could be so important that you needed to interrupt my set?"

You take a huge gasping breath in

"Oh?" She giggles slightly "of course, air. I'm such a scatterbrain aren't I sweety?" She smiles down at you

"Y-ye-" Mel cuts you off With another slap "It's was retorical. Cushions can't talk."

The rest of the day is a blur of feeling like you were suffocating, feeling like your head was going to be crushed and a slowly dampening ass sat on your face.

Every time you tried to speak there was a slap and every new workout was its own unique punishment but Mel found you struggled most with the mountin bike machine.

Not only was it causing her to sweat like crazy, turning your smothering into a board line water boarding session, but the pumping of her cheeks on your face was like having two bowling balls bounce up and down with every peddle.

Mel is huffing and puffing as she pushes herself on the bike, knowing it'll make it even better for you "wow! This is a steep hill..." She pants as she peddles hard "but your soft little face nuzzled in my crack is really helpful. Normally these seats are so hard on my little bottom."

As the person currently being crushed by her ass you knew it was anything but little.

The machine beeps to indicate that Mel has climbed to the top of th hill and she lets herself drop. Right on your face. Pushing you even further in between her cheeks "o-oh wow that was hard." Mel wipes her brow "but it's worth it to keep this shapely body in shape." Mel deliberately grinds on your face for a moment before standing "so listen baby boy, it's been too too long since we had a special aunty-nephew day." She looks down at you as your gasping, your head practically glued to the bike seat by sweat "I was hoping to come over for the weekend. I'd spend a few night with you and really help you remember your lessons. L"

You're too weak to answer

Mel takes this as a yes "excellent!" She beams "I'll be there Saturday morning, bright and early! Oh and I expect a lovely breakfast." She fondles her heavy balls through her yoga pants "because I'll definitely have a big one saved up for you by then."