Cease.

Suddenly, Jenna's hands start flailing against the cuffs, and you hear the distincitve "unh uh! unh !"
Immediately, you stop, running up to release the ball gag.
"Cease..."
"Yes dear. What's wrong?"
"Cramp!!! My leg...!!!"
You release her hands and ankles, and she collapses flat out, gripping her left calf and rubbing it.
"Awww....Oww...." she pants, pulling off the blindfold.
"I'm sorry honey."
"It's not your fault, baby. You were... wow, what you were doing was amazing... just my stupid leg..." She lays on her back, panting.
"Better?" you crawl up to stroke her face. It's sweaty and tear-stained, but she's smiling too.
"Yeah.. thanks..." she slides over to put you between her legs. "Don't stop now, James. I haven't been properly chastened yet."
You smile. What a fox.
You tie her wrists back to the head board this time, and leave off the gag and blindfold. You twist her nipples cruelly as you pound her pussy, with her legs resting on each shoulder.
"Oooh Ow...Ooh...Fuck...." she flails and raises her chin. "**** me...use your big strong hands..."
You remove her collar, never slowing your pumping rhythm, and you close both hands around her beautiful throat, slowly squeezing. Her face begins to turn red, and her eyes start to bulge.
"Yezz....joke me...." her words are strangled, and her eyes are watering. You exercise care not to overdo it.
"Ooo......" your cock is suddenly very wet, and you realize from the shaking in her legs that she cumming, and squirting. She doesn't normally do that. "Oh... zhit, baby... you made thmee sgwirt...." You ease off a little, and she coughs a little as she takes in more air.
"Should I fuck your naughty asshole baby?" You grip her hair, and she nods.
"Yes... gape me open baby."
You flip her over after releasing her cuffs. You re-tie them behind her back, and reclasp the dog collar, wrapping the leash around your wrist. You begin to slowly pull the buttplug out, slapping her red ass occasionally to produce a wailing squeal. With the buttplug out, you work your cock inside before the sphincter fulling closes back up, and Jenna wails with pleasure and pain.
"Oh...baby... so thick....."
"You're so fucking tight back here... I could get used to this." You slowly pound her ass, using the leash to pull her horizontal. With her arms tied back, she's **** to hold herself up with thighs and core, to avoid being cruelly choked. She succeeds for a little while, but as it goes on, she sags further and further, and you have to let her fall slowly to avoid really **** her out.
You start to rumble inside, and soon, you are ready to cum.
"I'm going to cum, baby."
"F.....fill...my as....s.....baby.. ...." She's in subspace, somewhere between consciousness and **** bliss.
"Argh!!!!!Fuck..." you pump hard, filling her ass with cum and pulling out to shoot a few droplets onto her beautiful red ass.
You give the cheeks one last smack with your palm, and she moans in pain.
"Good girl, Jenna..."
"That was amazing, baby...." she still in a bit of stupor.
You get to work cleaning her up, untying all the equipment and putting it away, and then you spend a few minutes kissing her softly, and rubbing a soothing cream on her buttcheeks.
"I love you so much, Jenna."
"I love you too James. Let's do that at least once a week! So intense...you're so commanding. I guess before, I wasn't ready for it, but I think I am, now. It's fun to just let go and let you have your way. I love being able to just put all my trust in you and let it happen..."
"Thank you, baby. I'll be happy to do it whenever you want."