___
You writhed on the bed, tugging uselessly against your restraints as Mona propped herself on her hind legs. She twittered--a high-pitched, keening sound--as she ground her pussy against your face. You made a noise of disapproval, but it only seemed to make her laugh harder as she anchored herself on your mouth, your nose bumping against her engorged clit as she forced you to swallow your complaints. A mix of juices drooled out of her, and you could taste it. Her cum. Your husband's semen.
"Oh sweetie," she murmured, with a hand wrapped in your hair. "Be a good girl."
She tweaked a nipple, clasping it tautly as she released her grip on your head--only to send a stinging slap to your inner thigh.
A warning.
"You don't want to be a bad girl, do you?" She spread her lower lips and clapped her cunt over your face. "You've always been a good girl. Don't fight it."
You felt like you were suffocating, eyes rolling to the back of your head as you breathed in short pants, taking involuntary huffs of her clammy pussy. Dimly, you could see the outline of a man sitting in a chair in the corner; the juxtaposition of him freely stroking himself while you were forced--bound and contorted--to be her seat, and his spectacle. Your face; her cushion, your torment; his pleasure.
You'd cry out--wail in indignation, humiliation, heartbreak--if only the gag in your mouth didn't press your lips apart, the circular opening allowing only your tongue to roam free, flapping aimlessly and more often than not collecting rivulets of her cunt-drizzle onto its surface. It was musky, tangy, sickly sweet. Not even the muffled pleas for air were heard over the sounds of her cumming.
Or, probably, she just didn't care.
Why would she? Why would she pretend to be your friend--answer your midnight calls, come over for corner store ice-cream runs as you recounted the woes of your long-suffering marriage--if she didn't enjoy listening to it? You'd thought--mistakenly--that it'd been concern for you. She was your oldest friend; your best confidante. Your maid of honour at your wedding.
Tears brimmed your eyes as they started to glaze over.
How could you have missed it? The lingering glances? Side-eyes? Not-so-secret shared smirks between them as you glided up the aisle and pivoted before the priest? You could see the glare of the wedding band reflecting on his finger--the white gold blurry as he stroked his thick cock in tandem with her vicious pace.
'Maybe,' she'd suggested one night, rubbing your shoulder consolingly as you rested your head against the crook of her neck. 'You need to try something new. I don't know? To reignite the spark?'
Visits to kink shops in the murkier part of town, subsequent purchases of ropes, cuffs, gags--other things that made you flush to even think about--had been made, all while she held your hand and dragged you back to her house to try it on.