That was the first of many visits to the laboratory, but I didn't get to play with the futabot again. Instead, I was the subject of investigation, and spent hours being interviewed, answering seemingly random questions, electrodes all over my head, a vibrator pressed to my pussy and purring away. Or sometimes I was strapped into the chair while feathers tickled my feet. Or bent over the table, strapped down and whipped at irregular intervals. But always the endless questions and electrodes.
And then there was the time I was in an MRI for twenty minutes, the magnet hammering away at my head while a mechanical butterfly fluttered against my clit. "Please try to keep still," Dr Evans's voice in my ears said repeatedly, while my fingers itched to scratch.
And the time I rode the Sybian until the questions blurred into meaningless words, my answers unintelligible anyway...
The sessions were exhausting, and always left me both bored out of my skull and horny as hell. On my train journey home each Saturday, I was invariably too tired to think or read or anything, yet too wired to sleep. I was consumed by the need to fuck, but lacked the energy to do anything about it.
I didn't have a boyfriend at the time - never being very good at keeping them - and was staying with Sasha, who had no wish to share hers (or to be shared between us, alas). "You're as bad as my brother," she muttered, scowling at me.
She certainly wasn't suggesting anything, but I perked up immediately. "Oh yes?"
Her eyes narrowed distrustfully. "Don't you dare!"
"Don't what?" I asked, pretending innocence as I snatched up her phone and scrolled through her contacts.
"Ali!" she hissed, trying to grab it back, but I ran to the bathroom and locked myself in.
"Dai? Hi," I said, ignoring the angry thump on the door, "it's Ali. Are you free tonight?"
"Er, sure."
"Why don't you come over? Bring condoms."
There was silence for a long moment. "Seriously?"
"Abso-fucking-lutely."
"Right," he said. "Okay. Be there in half an hour."
Sasha glowered at me as I peered round the door. "Is he coming?"
I nodded.
"Right, well I'm going. I don't want to spend the night listening to the two of you fuck."
Orgasms or not, being teased and tormented for hours is not the same as a good, hard fuck. I needed a cock in me. I needed to feel a man pounding his hard, hungry cock into me with pure, animal lust. I needed to feel that lust too, that need that banishes rational thought.
Dai, much as I loved his Welsh accent (bizarrely, so much thicker than Sasha's) and his rich baritone voice when singing, was not what I would consider boyfriend material, but he did have one very important attribute: convenience. Not only was he currently young, free and single, but he lived nearby.
And - most unexpectedly - he was hung like a horse.
He arrived even as his sister escaped. He flushed guiltily beneath her passing glare, but then she was gone and the door was closed and it was just the two of us. I pushed him back against the door and dropped to my knees, my hands working his belt open. "Um, hi?" he said, and laughed nervously.
I pulled his zip down and tugged at his waistband. Looking up into his eyes, I said, "I'm not looking for a relationship. This is just sex. Are you okay with that?"
He gulped. He actually gulped. It was cute. "Yes," he said, nodding.
And that's when his cock, semi-erect and hardening quickly, sprung out from his jeans.
Okay, so it wasn't the biggest cock I had ever had the pleasure of, but in terms of size and aesthetics, it certainly made my Top Ten (yes, I have such a list). I wrapped a hand about it, my thumb stroking the smooth skin, and I sniffed it to make sure it was clean. It was.
It was leaking precum too, and judging by the damp patch on his knickers it had been leaking for a while. "I would have thought the girls would be lining up to use you, Dai," I teased.
He was only nineteen, several years younger than me, always awkward around girls and quite possibly a virgin. Barely had I wrapped my eager lips about his now erect cock when he gave a panicked moan and thrust deep into my mouth. I recoiled, choking, as cum splashed against my face. With a frustrated whine, he tried to catch the rest of it in his hands, though cum escaped around the edges of his palms and squeezed between his fingers. "Sorry!" he cried, his cheeks bright red with embarrassment.
I tried to keep a straight face. "Go clean yourself," I said calmly, "and we'll try again."
And we did, though again he didn't last very long. While it was fun being the first woman he'd ever been with, I would have preferred an experienced lover. But beggars can't be choosers - in the absence of an experienced lover, an eager lover will suffice.
As the weeks went by, his stamina improved remarkably. He would wait for me on Saturday evenings, ready to service me the moment I got home, ready to practise the skills I was teaching him. He grew confident, and even a little cocky, which I didn't really mind.
The only problem was the way he kept finding excuses to pop round at other times during the week, not content with being just my Saturday evening lover. He complained that I was keeping him at a distance, which I was; and that I was keeping secrets, which I was - or, rather, I was keeping my private life to myself.
"I told you from the start," I said. "It's just sex. I don't want a relationship."
"Then let's have sex. Now. Why wait till Saturday?" (It was a Tuesday.)
"I have work to do tonight. Be patient."
"Where do you go on Saturdays? You always come back desperate for sex. Do you have another lover?"
To be honest, the relationship, such as it was, was exhausting. I would have broken up with him sooner if the sex hadn't been so good. "I think we should stop this," I said.
"Maybe we should," he snapped back at me, and stormed off.
The following Saturday, in Cambridge once again, I was waiting in the lobby for Dr Evans to collect me when Dai wandered in through the revolving doors. "What are you doing here?" I hissed.
He had the grace to look guilty. "I followed you," he said quietly as he sat beside me. "It's been driving me nuts not knowing where you've been going. I was sure you were meeting a man."
"I am," I said, seeing a very puzzled Dr Evans approaching. "Hi, Doc. This is Dai, my ex-FWB."
Dr Evans frowned. "What's an 'XFWB'?"
"Someone who will no longer be screwing me every Saturday night."
"Ali!" my XFWB whined.
Dr Evans studied him thoughtfully. "It's up to you, of course, but we could use him today. I mean, since he's here anyway."
"What do you mean, 'use me'?"
I shrugged. "Did anyone bring condoms?"
"There's plenty in the lab."
"He's big."
"I've got all sizes."
"Well, Dai," I said. "Feel like being a rat for a day?"
He stared at me, utterly lost for words.
"Last chance for you to be with me..."
He nodded unhappily. "Okay."
Dai followed Dr Evans and me through the maze of corridors and down the narrow stairs to the lab, and then into the room with all the cameras and other sensors. There was no sign of the futabot, much to my disappointment. "If you would both undress, please," Dr Evans said, leaving us alone while he went off, presumably to start the cameras and everything.
Dai looked round nervously, while I was quickly naked. "What's going on?" he asked.
"We're going to fuck," I said. "For science. Come on, get your kit off."
Dr Evans reappeared with a string of condoms and a clipboard, and took a seat in the corner of the room.
Since Dai seemed frozen with uncertainty, I dropped to my knees, as so often before, and worked his trousers open and down about his ankles. Inside his Y-fronts, his cock was discouragingly limp, but as I caressed it through the cotton and as I kissed his thighs, I could feel it stirring. "I want your cock in my mouth," I said, looking up into his eyes. "I want you naked in front of me."
With a nod of assent, he thawed at last, tugging his shirt off over his head and flinging it to the side of the room. I helped him out of his shoes, socks and trousers, and finally his knickers, revealing a cock that was no longer shy of so much attention.
With a moan of exaggerated lust, I took the hardening member into my mouth and sucked, my tongue teasing the smooth, delicate skin. "Do you like my mouth?" I asked after a minute.
"I fucking love your mouth," he said adoringly.
"Do you enjoy fucking it?"
Dai glanced over at Dr Evans, who was scribbling notes and glancing at us from time to time. "I love fucking your mouth," Dai said.
"If I had a cock, would you let me fuck your mouth?"
"What? No! I'm not gay!"
"I didn't say I'd be a man," I said, and returned my attention to his cock, taking it gradually deeper into my throat as his thrusting became less gentle.