Although technically the Saturday rule was still in place, we'd missed swimming on the day I came home. With it being the Christmas holidays, the usual timetable at the local pool had been revised, with adult swimming sessions moved into the mornings and evenings to accommodate extra children's sessions during the day. It made sense, but I didn't like it as I dragged myself out of bed at five a.m. on Sunday morning.
You might be asking, what kind of self-respecting uni student is able to get up at that time, but I had a couple of things in my favour. One thing was that swimming meant seeing Mum in her swimsuit, which was hot, but another was the fact that for the first time at home, I wasn't waking up in my own bed. Although we hadn't actually had sex again, we'd spent an hour kissing and touching each other in Mum's bed, and she hadn't made any suggestion that I had to leave afterwards. We'd slept in the same bed in my flat before, but there was something extra sexy about doing it at home, in Mum's bed, when she could easily have kicked me out.
So when Mum woke me at five, I managed to find the energy to grope around in the darkness for some clothes and find my swimming kit, lovingly washed and packed away by Mum since last time I visited. I figured I'd shower at the pool, so I was standing by the front door, ready to go, just after five-fifteen.
"Bus leaves at twenty past so we need to rush," Mum said, bustling downstairs and pulling her hair into a plait. "Have you got everything?"
I nodded. "Ready when you are."
"I just need keys," Mum muttered to herself. "Have you got money?"
"I've got a twenty," I told her, patting my trouser pocket. "I can pay for the bus, but you'll have to pay me back. My grant money is getting a bit low."
Mum laughed. "Such a gentleman," she teased, unlocking the door.
The session started at six, and since there was nobody else around at the pool, we had to wait outside for a couple of minutes while a girl who looked like she was a similar age to me came and let us in.
"Hiya Kayleigh," Mum said when the door opened, clearly recognising this girl. "You drew the short straw for the rota today?"
Kayleigh glanced at me before answering. "I've swapped it with Marilyn so I can have Christmas Eve off," she explained to Mum.
"Kayleigh just finished uni this year," Mum said to me, before turning back to Kayleigh. "This is my son, David, he's still at uni."
Kayleigh and I exchanged looks of mutual sympathy. I don't know why Mum felt the need to explain to a total stranger. Anyway, Kayleigh gave me a quid off since it was off-peak.
The pool was empty and undisturbed, and once the girl had taken my money, she went off to get her lifeguard gear. I walked with Mum down to the changing rooms, and as I turned to go into the men's, I felt Mum grab my wrist sharply. I was confused for a second, but one look at the expression on her face and I understood.
I'd never been in the ladies' changing rooms before, so I was a touch disappointed to discover that they were exactly the same as the men's, just a mirror image. Mum steered me into a cubicle and locked the door.
"We need to be quick or they'll suspect something," she said, and I felt a rush of blood to my cock as she pulled off her jumper and shirt in one movement, revealing the top half of her swimsuit. I could see her nipples were already hard and poking through the lycra, and I reached out to tease one of them. Mum responded by moaning softly and reaching down to undo my trousers.
By the time she'd pulled my cock out, I was fully hard, and she stroked my shaft a few times, stepping close so we could kiss. I pushed her skirt down over her hips and squeezed her arse, sliding my hand under the material of her swimsuit. I pushed my fingers between her thighs and felt her moan again as I found her wet pussy. She spread her legs and after a couple of teasing movements around her pussy lips, I pushed a finger inside her. She pulled me closer, to encourage me, stroking my cock faster. I started to move my finger in and out, but Mum broke the kiss and whispered, "Use two fingers, baby."
It was actually a bit of a struggle to fit a second finger inside her, I think because of how we were standing. Mum seemed to realise this after a minute, and she shifted slightly, putting one leg up on the cubicle's bench and making it easier for me to start pushing two fingers in and out of her. Her moans got louder, and I instinctively wanted her to be quieter, but there was nobody around and I felt a rush of arousal when I thought about Mum's moans filling the changing rooms.
"I'm so close," she said breathlessly after another minute. "Don't stop."
I didn't, and I was rewarded when she moaned loud and tensed her body as she orgasmed. Practically every other time I'd made her cum, we'd been in bed or it had been dark, so this was the first time I really got the chance to watch her face as she orgasmed. She looked incredibly hot and my cock was throbbing extra hard. When she came down, she sighed happily and gently pushed my fingers away.
"Now it's your turn," she said, increasing the speed of her stroking, and I relaxed, ready for her to make me cum. Unfortunately, at that moment, we heard voices coming from outside the changing rooms. Mum let go quickly.
"Get dressed," she said urgently. "If anyone asks, say I'd accidentally taken your swimming shorts or something."
Frustrated, I pulled up my trousers and, after adjusting my cock so the bulge wasn't too obvious, I stepped out of the cubicle. There was still no one in the changing room, and I walked briskly back to the door, doing my best to look like I belonged. Thankfully, whoever the voice was, they'd gone, and I made it to the men's changing room without any awkward questions. When I got inside, there was an old bloke hanging his towel on a hook, and I guessed it was him we'd heard coming in.
I had to wait until my hard on was gone before I could shower and go out to the pool, and when I got there Mum was already in the water. Kayleigh was sitting in the lifeguard's chair, swinging her legs gently and looking bored.
We did our usual swimming, although I was working very hard to keep my mind off sex so I wouldn't get hard again. The old guy was the only other person who came to the pool the whole time we were there, and he worked his way up and down the slow lane steadily.
I waa in good shape from football, but swimming uses different muscles and after forty minutes, I was tired and needed a rest. Mum, on the other hand, didn't seem out of breath at all.
"I'm gonna do some diving at the deep end since it's so quiet," I told her when she paused between lengths.
"Okay honey, I'll only be another twenty minutes," she said, pushing off from the wall and giving me a view of her arse that I furiously tried not to think about.
At the deep end, I started with surface dives, swimming to the bottom and touching it before coming back up, working on using just my leg strength to swim downwards. After several attempts, I climbed out of the pool and stood, dripping, by the side, trying to decide on the right way to dive in.
"You need to breathe out more as you go down," I heard someone say, and looking around, I saw Kayleigh looking at me from the lifeguard's chair.
