There comes a point when the number of candles on the birthday cake becomes impractical and you find more imaginative ways of representing the number of years. Perhaps you change the shape of the cake, or get special candles.

The same is true with more sexual ways of marking the occasion, of course.

While you're young and carefree, 20-something orgasms in a day might conceivably be achievable with a motivated partner. Edges, for the kinkier and/or less orgasmic slut might be a frustrating possibility. Perhaps even with one big and messy celebratory orgasm at the end.

For the slutty and well connected, 30 different cocks in a day (or night) might have a chance of being realised, and would certainly make for a memorable party.

Once you get to your 40s though, even that might be beyond the reach of most.

Spanks naturally seem like an easy and satisfying way of marking the number, but that's hardly enough for a real painslut. So just like with the candles, you need to look for alternative ways.

I let her sleep late as a birthday treat, knowing she'll be grateful for the extra rest once I'm finished playing with her. By 8am I'm restless and keen to get started, so lay out my tools and toys and go to wake her.

She's obviously been warm in the night, as one foot is poking out of the covers as she lies on her front. Perfect. I drop to my knees and suck on her shiny red toes, eliciting a happy mumble in response. I swirl my tongue and drag my teeth as I fellate each one, then slip the restraint around her ankle, buckling the deep red leather snugly but not too tight.

She hasn't seen these particular restraints yet; they're a birthday present commissioned from the finest soft leather and gold plated hardware. My aim is for her to be too distracted to even notice them until I've finished with her.

I take a long lick up her wrinkled sole as I expose her other foot, repeating the same slow process of sucking and kissing as I fit the other cuff. By the time I'm done she's humping the mattress.

Not wanting her to fully wake before I'm ready, I move a little quicker getting the straps onto her wrists. She doesn't resist; being used to wearing restraints she enjoys the feeling of nothing but cuffs and collar.

By the time I move up to wrap the collar around her neck she's somehow managed to move her hair out of the way, presenting her bare neck for me to apply the soft leather without even seeming to have moved. As I fasten the shiny gold buckle she finally opens her eyes and smiles up at me mischievously. I lean down and kiss her, sliding my hand around to grip the back of her hair and my tongue pushing deep into her smiling mouth. She returns the kiss with enthusiasm, always encouraging of my greed for her.

I lose myself in the moment briefly, then realise with a start I'm in danger of losing control of the situation. Before that happens, I pull back stand up, presenting my rock hard cock to her lips and I'm instantly rewarded with a shiny-eyed grin as she lunges forward to suck me in deep. She loves sucking cock, and since it's her birthday I let her enjoy it for a few moments.

Then without warning, I pull back and slip a ball gag into her mouth, leaning over her head to fasten the matching red leather behind her head. She looks up with surprise, confusion and perhaps a little outrage at being denied a mouthful of cum to start the day.

I don't give her time for the frustration to build; wrapping the chain around my fist a few inches from the collar I pull her out of bed. She slides and stumbles to her feet, but I give her no time to recover. I pull her firmly towards the bathroom, then spin her around and push her down to sit on the toilet.

She used to have trouble peeing in front of me, or in fact anyone. It took some training, but now things seem to flow easier, if not entirely freely. She has even been known to piss in a glass for an audience when suitably motivated. Still, it takes some time for her to relax and let it out. I put a finger under her chin, lifting her head to maintain eye contact as she empties her bladder. She blushes, but holds my gaze with a little pinkness in her cheeks. I smile at the shade, knowing her ass cheeks will soon glow with the same deep pink.

I pull on a pair of black latex gloves, then wipe her myself. It would be easier to let her do it, but the embarrassment I know she feels sets the scene better for what's to come.

Grabbing the gold plated chain again, I pull her to her feet and she follows obediently through the house and down the stairs to the basement.

In the basement we have a few fun items of bondage furniture, one of which is a spanking bench. It has a lightly padded top piece that she (or sometimes I) straddle, and lower pieces either side that she kneels on. It's the perfect height for spanking and fucking her, and leaves her holes perfectly accessible. It also has various modifications for attaching toys or restraining her in new and experimental ways.

She knows just where she's headed as soon as we start down to the basement, and eagerly climbs onto the bench, allowing me to restrain her ankles and wrists, and I also attach her collar to a new fixing point, keeping her almost perfectly immobile and exposed.

I run my latex-covered hands over her curves, calming her a little as she waits nervously for what comes next. She's still not fully awake, but she will be. She bucks a little as I work the cold lube into her asshole, shivering and humping as the goosebumps spring up on her legs. I ignore this reaction, and work the nozzle of the enema device into her tight hole. It goes in fairly easily; she's more than used to me putting things into her holes and is very good at relaxing for me.

I lift the litre bag up high onto a ceiling hook, a special mixture I prepared overnight, then go and crouch to look into her eyes.

She makes eye contact, her full attention on me.

"I'm trying something new today," I tell her, "That is a coffee enema, and you're going to keep it in your ass for 15 minutes before we really get started. It should wake you right up and make sure you don't miss a second of your birthday."

She moans into her ballgag, then I kiss her cheek and busy myself with making my own coffee and making the rest of the preparations. She remains mostly silent, and I make sure to reassure her with occasional contact; squeezing her ass and running my hands over her body as the bag empties into her ass.

Pretty soon the 15 minutes is up, and it's time for her to let it go. Again, she found it difficult to relax and let it happen at first, but it gets easier with practice and my finger sliding in and out of her ass to help her release. I catch it all in the bucket we keep for the purpose and clean her up.

I check in with her briefly, getting an enthusiastic nod when I ask if she's ready for more fun. We check her safe word/signal, and she gives me three grunts as she clenches and unclenches her fists. Perfect. I kiss her forehead and get to work.

First I lube her ass again, generously, and insert another enema nozzle. This one is bigger and will continue to fill her ass for the next few minutes. She will feel full and stretched and will struggle to hold it all in. I'll do my very best to keep her distracted, naturally.

Next I attach a heavy duty magic wand to the specially designed mount, pushing it hard against her clit and clamping it in place before turning it on low. She moans into her gag and squirms against it happily.

I don't give her any warning of the next part, the first she knows of what comes next is the heavy thump of the thick leather flogger on her left arse cheek. She squeaks in pain as I instruct her to count.

I make the hits firm but not overwhelming; there will be plenty of time ramp up the intensity. She counts each one, not quite intelligible through the gag, but I always enjoy when she talks with her mouth full. By the time she gets to 44 the alternating strikes on her freckled ass cheeks have made them quite pink. I squeeze the last of the larger enema bag into her ass and remove the nozzle slowly, hoping to get a little leak I can punish her for. Not a drop escapes her pretty little pucker, not even when I rub it gently with my fingertip or swirl my tongue around her hole.

I move around to her face and tell her what a good girl she is as I apply lube to my next instrument. She knows the anal hook well and loves the aesthetic, even if the unforgiving steel doesn't give much against her soft flesh. Her eyes follow my fingers as I apply plenty of the lubricant, then I move back behind her to insert it. I feel her working to hold in the liquid as I push the cold steel ball into her ass, and she manages to keep it all inside as the ball and a couple of inches of shiny shaft slides inside.

I feed the rope from the other end of the hook through the loop on the back of her collar and up to the ceiling, and again she squirms, getting used to the feeling of the cold metal inside her liquid-filled asshole.

I click the wand intensity up a couple of notches, rewarded by another hump and moan.

My next toy is a wartenberg wheel, a nasty little spiked circle with a handle that can feel deliciously painful when used on delicate skin. I don't let her see it but she immediately recognises it as I scribe a neat 4 on her left arse cheek. Again I instruct her to count as I follow the wheel with a heavy thump of her favourite leather bound paddle. She hums and manages to drool and slurp out a "1" around the gag. She wiggles invitingly, offering me her other cheek for the next spank, but I pick up the wheel again and trace the same 4 as close as I can to the original on the same cheek and follow it with another hard paddle hit.

She gurgles out a hesitant "2" as the implication of keeping the impact on the same side sinks in. She realises I intend to give her 44 on each cheek, rather than alternating the count.

By the time I trace the third 4 on the same path and hit her again, she has regained her composure and steeled herself for the next impact.

On it goes, the pinwheel and the paddle taking turns in raising the pinkness in her left cheek while her right remained white and hardly touched. I snap a couple of pictures to enjoy with her later as I get close to the 40s.

Finally, she gurgles out the "44" and I let her rest a moment. I check in and make solid eye contact, and she manages to give me a nod. I note that the strings of drool from her gagged mouth have left a little pool beneath her, and make a mental note to tell her about it some time when we're in public together. I scoop the strings that dangle from her gag and wipe them over her face. Part of her is disgusted by it, but in subspace she loves the extra humiliation.

Back to the pinwheel and paddle, I turn up the wand again to just a little below her usual level for cumming by herself, then review my handiwork on her left arse cheek. There is a distinct and painful-looking 4 carved into her soft flesh, not quite enough to break the skin besides a few tiny pinpricks of blood. This is surrounded by a deep pink glow covering most of the cheek. Next to her barely touched right cheek it looks painful and sore.

I push a still gloved finger into her aroused-looking pussy, surprised by just how wet and slippery she is. On a whim I bend down for a lick, and her whole body quivers as my tongue dips inside her hot cunt. I grin and get back to work.

She gasps as I trace the first lines of the 4 on her right cheek, then immediately follow with the paddle. She counts without needing to be told, and on we go, wheel and paddle until her right cheek begins to glow too.

By the time we get to 30 she's moaning and muttering between each impact and humping the wand. She's definitely in subspace and I savour the moment of control and intimacy as I continue administering the painful treat to her ass.

Finally, with a triumphant splutter she calls out the "44" and breathes deep. I set aside the tools and move around to kiss her. I remove her ball gag and kiss her deeply through the mess of drool. Her jaw seems tired but her tongue is full of needy energy. I resist the temptation to stay there, instead pulling away and again presenting my cock for her to suck on. Somehow she is even more eager than when she'd just woken up, and sucks so hard it almost hurts.

Reluctantly, I pull my cock out of her mouth once more after just a couple of minutes and get close to her face.

"Count for me one more time," I whisper, and she nods.

I move around behind her and plunge my cock deep into her hot, tight cunt.

"One," I prompt her, and she repeats it.

"Two," she enunciates clearly as once again my cock thumps balls deep into her.

I reach down and turn up the wand, enjoying the spasm of her pussy in response to the increased buzzing. She grunts and continues the count, each slow and purposeful stroke giving her the full length of my cock.

By 20 her speech is ragged and breathless, and when I grab the shaft of the steel hook buried in her ass she is barely able to manage the count at all.

"When you get to 44," I instruct her, "You're going to squeeze my cock hard and cum for me. Understand?"

"33, 34, Yes Sir, 35, I will cum for you, 36…"

"Good slut."

"39, Fuckkk, 40, Yes, thank you Sir, 41…"

"Now, you greedy painslut, cum hard for me…"

"43, 44, ohhhhh ffuuckkkkkkkkk…"

She cums hard, my cock pushed deep inside her as she squirts on my thighs. Her legs tremble and her hands form desperate claws in their restraints. Her toes wiggle and her whole body shakes, tensing in waves as the orgasm rips through her.

As her climax begins to subside I start to thrust again, this time with my own pleasure in mind. Having her completely in my power means it doesn't take long before I get close, and hearing my own orgasm approach seems to bring her back for another one. I grab handfuls of her soft arse cheeks as I reach the point of no return, and the heat and pain in them seems to suddenly bring her there with me. As my cum erupts up through my shaft she shudders hard, her thighs straining against her restraint and as she cums again she loses control of the enema and soaks us both in the hot water as it flows around the anal hook.

I grin in victory at her loss of control, and step back as she realises what's happening.

Many hours later, after a long shower and presents and cake and champagne with friends, I squeeze her tender arse cheek in a quiet corner.

"How will I ever top that for your birthday?" she grins into my kiss.