The house is in darkness when we stumble through the front door a bit later. My housemate must be out as well. I fumble some lights on and take Petra's coat off her shoulders and let her collapse onto the sofa while I hang it up with mine and relock the door. 'D'you want some water?'

She sits upright, then flops a little back into the sofa, trailing an arm along the back. 'Got any tequila? We could do another shot.'

'Are you nuts? We've both had enough, you especially. Anyway,' I lean over her and kiss her quickly on the mouth, before she can react. 'I was thinking we could go straight to bed.'

She catches my arm and pulls me back down, kissing me back. I feel my knee slide between her thighs and enjoy the easy way her legs move apart. She pushes her tongue into my mouth and wraps it round mine, and now suddenly there's a sexual hunger to her. The kiss is wet and hard, and I like the way she fills my mouth. She rubs her mouth quickly afterwards. 'I remember now. You're going to kiss my onion-cigarette-tequila breath and touch me all over.' She reaches up and pulls her fingers gently through a thick strand of my loose hair.

'Yep.' I press her thighs a bit further apart with my knee, pushing at the hem of her miniskirt and feeling the heat between the tops of her legs. 'And do you with my mouth. I didn't say that earlier, but I will. I really want to.'

'Ohmmm, yes.' She closes her eyes for a second. 'I love that,' she says quietly and she shifts her hips forward on the sofa so she can press herself onto my knee. 'And with your knee, if you want.' She grins. She is hot and softly wet through my tights. Then she looks at me hard and runs her hand over my arm and shoulder, then down over the front of my dress to cup my breast. 'But I'm going to fuck you first.'

I shrug. Her firm but gentle squeezing of my breast turns me on. Her eyes are wide again and her face and throat are flushed. The fact she's aroused turns me on too. The lust has begun to sober her up a bit. I catch her gaze. 'If you really want a drink, we've got some peach schnapps, I think. No tequila, though.'

She grins. 'Let's take the bottle to bed.'

I laugh and stand up, holding out my hand to her. 'You alco.' I pull her up onto her feet and make sure she bumps up against me. We kiss again, wetly and heavily, our tongues probing each other's mouths. I can feel her little breasts on mine through our clothes, and our thighs are pressing together. I normally like to start slowly and softly and work up to a hard fuck, but the way Petra keeps pushing her tongue into my mouth and not taking it slow is surprisingly arousing. I enjoy the thought of letting her take me roughly.

I tell her where to find the bottle while I get two glasses of water from the kitchen, then she follows me clumsily up to my room. She shuts the door while I put the water down then we fall on the bed and start snogging like two desperate teenagers. Our hands start to wander, although she is still holding the schnapps in one hand, trapped between our hips. After a bit, I take the bottle out of her hands and put that on the side as well. As I turn back, she moves and takes hold of my shoulders to push me back down into the bed. I push her back a little and break the kiss. 'Uh...shoes. Sorry.'

'Fuckssake,' she mutters, but with a grin. She props herself up and reaches down to yank her shoes off, while I kick mine onto the floor as well. Then I push myself back onto the bed properly, smoothing down my dress as I do, and watch her crawl towards me across the covers. Her eyes flick down me, including where I'm rearranging my dress, and she grins as if to assure me I may as well not bother. I hold my breath and close my eyes as I wait to feel her lower herself onto me and move between my raised knees. But she doesn't.

When I open my eyes again, she's grinning broadly, and working her opaque grey tights down her legs. 'Oh no, shit,' she chuckles. 'Don't watch. I was liking it with your eyes closed.' She gets the tights past her knees and starts to wiggle them off her lower legs. 'There's no sexy way of doing this.'

I laugh and shrug. 'You could take mine off too, to make up for it.'

She kicks hers off her legs clumsily and moves forward, running her hands gently up my legs to reach under my dress. I lift my hips for her, and she grabs hold of the tights. She grabs hold of my knickers too, by accident, but I just let her pull and wait for her to realise. When she does, I shrug again and watch her eyes widen before she smiles dirtily. She pulls the lot over my knees, down my lower legs, and dumps them on the floor. Her hand runs back up my bare leg, between my knees and over the insides of my thighs. I let them fall open and she moves between them. The corduroy of her skirt is rough on my sensitive skin, sexily so. She leans over me to kiss me – a hard, wet kiss, which I arch my back into. Her hand slides between us, pushing my dress aside, and I feel her knuckles press into my crotch.

The pulse of sheer sexual pleasure hits me in the tummy. 'God, Petra...yes...'

She leans on me and nuzzles my neck. 'I want you, Fi.' She is pressing at my clit, moving a finger up and down my slit. I want her inside me.

'Take me, then.' I reach down and unbutton her skirt, push the zip down. She lifts herself slightly, to let me push it down off her bum. Together we kick it onto the floor. I rest a hand on her bum and squeeze gently as she moves back between my legs and turns her hand to press her finger onto my clit. She begins to move against me and starts to circle her finger.

It feels good, and I like the way one of her fingers is also pressing gently between my lips. I move my hips in rhythm with her fingers. I seek her mouth with mine and pull her tongue into my mouth. I do want to feel her inside me, eventually, but what she's doing first is good for now. I stroke my hand over her taut bum though her knickers.

It feels good, but I realise after a bit that it's not really going anywhere. It's the kind of nice touching that could go on for ages without tipping me over: sometimes that's nice, but tonight I want it intense and hard. I start to move my hips a bit less and kiss her deeply as she moves her hand away from between my legs. There's a question in her eyes, and I wonder if she's not as experienced as I thought. I think quickly. 'Uh, sorry.' I look at the bedside table. 'I need water.'

She rolls off me and I reach over for a glass and sip at it. She takes the top off the bottle and sniffs. 'Hmm. Smells sweet.' She watches me prop myself up a bit and brush my dress back down over my thighs. She leans her shoulders back on the headboard.

'It is.' I smile at her. 'Try some.'

She sips cautiously, and I like the way her eyebrows shoot up. She takes a full mouthful and grins, wiping her mouth on her wrist. I put the glass back on the side, slightly leaning over her to do so, and take the bottle out of her hand. She watches me take a mouthful of the schnapps, then takes the bottle back. As she takes another swallow I run my hand over the front of her blouse and press her breasts gently, before beginning to unbutton it from the top down. She re-scews the top on the bottle and puts it on the side as she lets me push her blouse open to expose her pale, smooth body. She closes her eyes as I lean in and kiss her flat tummy.

Then she takes charge again, moving from under me to turn me onto my front. She runs her hands all over me, then moves my hair out of the way so she can unzip my dress. Under the open flaps, she runs her hands over my back and unclasps my bra. I lift myself up a little and we get the dress and bra off my shoulders and down my body. She pulls it down over my hips and off my legs, and drops it on the floor. I look back over my shoulder to watch her straddle my legs as she shrugs her blouse off and drops her bra on the floor too. Then her hands run over my bum and legs and back, and she slides down a bit and then I feel her lift my hips and push a hand between my legs. Her fingers press hard into my heat and I gasp in surprise as she pushes two inside me.

I know I wanted her hard and inside me, but for some reason it doesn't feel quite right. It's not her fault, she does everything that would normally work and I'm not sure what's wrong, but again, after a little while, I start to lose the pleasure a bit. But I don't want to stop again, I don't want to worry her or hurt her feelings or piss her off. So I pretend a little bit. I screw my eyes shut and hide my face behind my hair and move my hips back onto her hand sexily to try and feel it again. I hate pretending, and I'm lucky enough not to have had to much, but I can do it pretty well when the need arises.

After a bit of thrusting, I manage to arrange it so that I turn round again onto my back and pull her down onto me. I can tell from her face that she thinks I'm really into it, and I feel a momentary twinge of guilt. I kiss her to make my doubts go away. I like the way her small breasts brush over mine, her nipples scraping my skin as she squirms on top of me. Her face is so pretty with its flush of excitement. Her hand goes back down between my legs, and for a while it's good again. She gets the balance of circling and thrusting right. It's easier for her this way round.

Which makes it easier for me to fake an orgasm, when I decide it's gone on too long.

She cuddles into me, and I stroke her back and dislike myself a bit more as I tell her it was so good. Her body feels quite frail and young and delicate in my arms, she's so thin and pale. She kisses my neck and throat and plays with the ends of my hair on my breasts. I blow some hair out of my eyes and nuzzle her neck and find myself wondering what the sex is like between Petra and Diana. From what I think I know of Diana, I imagine she would have no patience with the sort of mediocre sex we've just had. I wonder how it works between them, and I'm gripped with a sudden urge to know. But I bite my tongue and try not to think about it.

After a bit, we reach for the bottle again, and swallow a few more mouthfuls. Petra shakes her head when I offer her the bottle a third time. 'I think I'll be sick.' She grins.

'Put it back there, then.' I hand it to her and watch her put the top back on. The front door bangs downstairs, and she jumps. I put a hand on her arm. 'Don't worry, that'll be my housemate.' We hear muffled voices, one male, one female, and stifled giggles and the light thumping noises of two slightly drunk people kissing against the wall in the hallway. 'Sounds like she's pulled too.'

We cuddle under my duvet and listen to my housemate bring her conquest up to her room. 'I so need to move out,' Petra moans into my shoulder where we're spooning and I feel her suppress a little yawn. 'I'd love to be able to just bring someone home, like you two can.'

I reach back and stroke her side. 'It'll happen. Or maybe Diana will ask you to move in.'

She laughs softly. 'No fucking way. She'd never do that, and I wouldn't ever want to. We just fuck, me and her. It's nothing serious.' She wriggles against me. 'C'mon, Fi. You know what she's like.' Her voice is slurred again, and she's beginning to sound a bit drowsy.

I hmmm in non-committal agreement. I decide to make up for pretending to like the sex by coming clean about Diana. 'You know, I was really angry when I found out about you two.'

I feel her smile against my shoulder. 'I knew you were.' She makes an effort to concentrate. 'So, you two were fucking after all?'

I sigh. 'No. That's the point. I didn't want that. I, er...I went through a patch of thinking I wanted more from her.' I shrug and leave it at that. 'We only ever kissed. Twice.'

There's a moment of quiet behind me and I feel Petra breathe in and out against my skin. Then she says, 'She talks about you a lot, you know.' She strokes my arm gently. 'Not by name, I didn't realise it was you. But she mentions the one who got away quite a lot.' I feel her smile on my shoulder again, then she moves her head and puts her lips close to my ear through my hair. 'Actually, she calls you “the clit-teasing little bitch” mostly.'

'That sounds like Diana.' I sigh and think for a moment, then decide to ask. 'What do you think she'd say about us doing it?' I move my hand from her side, down over her knickers to stroke her leg. I wonder if I still want to try going down on Petra, and decide I probably do.

Petra giggles drowsily. 'I dunno. I could ask her next time?' She senses that I'm getting ready to start something and instinctively moves onto her back. I move round onto my side to face her and move my hands to the waistband of her knickers. She lets me pull them off, and I shove them down the end of the bed. She reaches up for my neck and pulls my mouth down onto hers. We snog wetly for a while, enjoying the feel of our naked bodies moving against each other.

I don't like myself for asking, but I do have an urge to know. 'Is there, y'know...is there something she really likes doing to you?' I feel cheap and dirty, and at the same time excited by my sudden idea. 'Something I could try too?'

She lets out a little half laugh and turns her head on one side, wiggling her shoulders into the pillow. I like the way she obviously feels comfortable in my bed. (It is a good bed, queen-size, with a soft mattress and big pillows. I like sharing it.) She lets me slide a thigh up between her legs, and I feel a smear of her wetness on my skin. 'Mouth-fuck me, Fi. That would be hot.'

***

She is slick and hot, but I take my time about teasing her clit out of hiding. She sighs in a release of pleasure when I do, which turns me on. Maybe I can save this sex, after all. The rich scent of her excitement fills my nostrils and I feel little smears of it on my chin and cheek. I run my tongue along her length and roll the taste of her around my mouth, enjoying the way she sighs in pleasure again. She pushes her hips onto my face gently as I rest a hand on her hips to guide her rhythm, then I begin to gently suck on her clit.

I'm quite good with my mouth, and I can go on for a while when I get into it. I like being gentle, and the way Petra is beginning to grunt softly in pleasure makes me want to prolong things for her.

I start to bring things right back, barely touching her at all, just using my lips and the softness of my breath on her. Her body hardly moves as she focuses on the sensations.

Or so I think.

When I realise she's barely moved at all for a bit, I lift my head quickly and glance at her. Her eyes are closed, her breathing gentle and even. I whisper her name, and feel my heart sink when there's no response. I run my hand from her hip over her tummy to her breast. No response. I rest my hand on her chest for a moment and feel her soft breathing. 'Petra?' I whisper again. No response.

Great. I've just sent her to sleep with my lovemaking.

Feeling a complex mix of embarrassment, frustration, disappointment and anger, I pull the duvet back over us and bunker down into the bed, trying not to touch Petra. Fortunately, it's late enough, and I've drunk enough, that I pretty quickly fall asleep myself.