Author Note: I just want to take a moment to thank everyone for their kind feedback and comments on all the other parts of this story. I hope to keep improving and write more stories in the future. Thank you for reading and I hope you enjoy this final part.
The first thing Mum did when I got home was scold me.
"You know I could have lost my job, texting like that at work," she said severely, grabbing my wrist to show she was serious.
"I know, I just..." I tailed off, not really having a real excuse.
Mum shook her head. "You've got exams coming up and I want to see you using the holidays to really knuckle down and get some work done. I'm worried that all this sex has meant you're behind on your revision."
She was right, of course. I was miles behind on my work because if I wasn't actually fucking Georgia, I was being teased by Lydia or fantasising about having sex with Mum. Even now, Mum was wearing her unsexy work clothes and all I could think about was taking them off her. But it wasn't our day until tomorrow and I just had to wait.
"I'm serious," Mum went on. "You can relax when Georgia is here, but until then if I don't see you working then we won't be having sex."
"But Mum, I'm not a child," I complained. "I can look after myself and plan my own time."
She shook her head, her gorgeous hair sliding over her shoulders. "No way. You work, and I'll tell you if I feel like doing anything."
I spent the rest of the day feeling sorry for myself, sitting in my room refusing to work on principle until teatime. Then, after having home-cooked food and watching TV, I started to feel better.
"We're still swimming in the morning, so set your alarm," Mum reminded me as she went up to bed.
Mum looked sensational once again in her swimming costume, but despite how horny she made me, she was true to her promise, changing into old clothes so she could clean the washing machine for the afternoon and leaving me to work. I realised that the only way to get what I wanted was to actually do the work, so I put on my headphones, shut my bedroom door and got on with it.
"Two complete essays and I've written up all my lecture notes," I announced later, when Mum was cooking. "Tomorrow I can start revising for my exams and get started on my final essay of the holidays."
Mum beamed at me. "I knew you could do it if you focused," she said, hugging me and kissing my cheek. I put my arms around her waist and tried to turn it into a snog, but she pushed me away gently.
"Later," she said, teasingly, going back to cooking.
Once we'd eaten and I'd washed up, I realised what 'later' meant. I was about to turn the TV on when Mum pushed open the door and looked in.
"Are you ready?" she asked.
"Ready for what?" I replied, slightly confused, until she stepped inside. She was only wearing a black bra, which had sheer mesh fabric for the cups which clearly showed her nipples, and a thong, which she showed off by turning around and letting me look at her bum.
"Fuck, Mum, you look so hot," I said, unable to take my eyes off her.
"Thanks," she said simply, walking over to me and climbing onto my lap to straddle me. It briefly occurred to me that this was exactly where Lydia had been two days ago and as I kissed Mum, flicking my tongue over hers, she rubbed her pussy on my hard cock. It felt so good to know that, this time, it could end in sex.
I slid my hands onto Mum's arse and held her in place, looking at her sexy tits as she moved on top of me.
"What are you thinking about?" she asked softly, looking at me.
I smiled guiltily. "Lydia was sitting on my lap like this two days ago."
Mum moaned softly. "Oh? Did you fuck her?" she asked.
"No, I didn't want to cheat on Georgia," I replied, aware of how ridiculous this sounded with Mum rubbing on my cock.
Mum reached up and undid her bra, letting it fall onto the sofa beside us. I leant forwards and started to lick one of her nipples, brushing it with the edge of my tongue and feeling it getting hard.
"Do you want to fuck her?" Mum asked, this time sounding genuinely curious.
I sucked her nipple into my mouth for a second before answering. "Yes," I admitted. "I really did."
Mum moaned again and started moving faster, my cock constricted inside my jeans, so I pushed her hand down to undo them. She quickly unzipped me and climbed off long enough to free my cock, and I pulled my shirt off too.
Back on top of me, her thong was rubbing directly against my cock and it felt amazing. I watched her tits bouncing on her chest as she moved, and after another minute, she raised herself up, moved the thong to one side, and positioned my cock next to her pussy.
"Condom?" I asked, hopeful that we wouldn't need one.
"Shit," Mum said, letting go of my cock. "Almost forgot, I'll get one from upstairs."
She moved to get off me, but I gently held her still.
"Baby," she said, gently chiding me. "I would love to have your cock inside me right now but I can't risk getting pregnant."
Just hearing the word sent a thrill through me. I don't know what it was: if it was Lydia or Georgia then it would be the last thing on my mind, but the naughtiness of knocking Mum up was intense.
"Just... put it inside," I said, softly, kissing her neck. "One time, then we'll get a condom."
Mum hesitated, so I reached down and moved my cock into position. She moaned and I knew her resistance was weakening.