Please read first chapter if you can, to understand the storyline better and perhaps enjoy it more...
After having been wanking in private for so many years and being careful not to have mom catch me whilst doing it, it had felt quite liberating to have done in front of her, and, even better, with her doing the 'wanking off' part for me. It was an amazing, exhilarating feeling. It felt like some chains on my sexual freedom had been removed, although why I had these aches in my balls was still a bit of a downer in the whole situation. Hopefully, it was just a phase that would pass, as Dr Taylor had said.
After a few moments of pondering my thoughts, I decided I'd better clean up and dress, just in case mom came back in to talk to me. After washing myself down below, and putting on some clothes, I sat on the bed. The ache in my balls had gone as normal, after cumming a few times during the evening.
After a few moments, Mom knocked on my door and came in. She was fully dressed again and looking all prim and proper. Seeing in her normal clothes again, it excited me even more that I had seen her in her underwear and felt up her ass with her permission. My dick stirred as she walked in. She smiled at me and said, "We'll have a session in the morning as that went quite well. As I have to go to work tomorrow, I'll knock on your door before leaving and we'll see if we can get a sample, to start keeping a record of your specimens."
"OK, mom" I said, smiling back, and trying to sound cool and calm. In reality my dick was getting hard again in my pants, although I didn't think I could cum again so soon now.
"I'll leave you to get on with your normal stuff now," she added, and disappeared off to get on with her nightly routine.
I looked over at the clock on the wall of my bedroom. It was 10pm. I thought about what mom had said about the morning. I normally went to college much later than when she left for work. I'd have a bit of a lie in after our session. I wondered what she would wear for me, and my dick stirred again. This all was rather amazing that it was actually happening.
I decided to try and take my mind off it and save my energy for tomorrow by playing a few video games on my PC and then go to sleep. I walked over to the PC in the corner of my room and got lost in playing 'Tomb Raider' in no time.
"Jacob" I heard a voice say and something nudge my arm. "Jacob, wake up." It was morning, and mom was waking me up.
I opened my eyes sleepily. Mom had opened the curtains and daylight was flooding into the bedroom. I had a semi-hard on under the sheets. I noticed mom was fully dressed in a black knee length skirt and cream coloured blouse.
"I'm running late," she said and sounding annoyed. She must have been in one of her moods. She was often like that in the mornings.
I noticed she was holding the semen-measuring beaker in one hand.
"Come on, we must be quick about this," she said, pulling the sheets off me in one movement, and still sounding a bit pissed off.
She saw my semi hard on poking through the gap in the front of my pyjamas. I normally slept with just those and nothing on my top half. "Well, at least that's a start," she said, sounding a bit calmer, but business like.
This all still felt a bit weird.
She folded the sheets right back and said. "Take off your pyjamas and lie back on the bed naked, like you did last night."
I did as I was told, and lay back on the bed with my semi hard-on wavering below me. Hearing her talk like that was getting me going.
"As I'm running late, we'll have to manage like this," said mom, pointing at her clothes. "I don't have time to mess about, dressing and undressing. You can touch my butt again through the material of my skirt, if you like. That should be enough stimulation for you, together with my hand."
I felt a bit disappointed that she would not be taking her clothes off, but as mom positioned herself again, like she had done last night, with her butt angled slightly towards my face and bending over me slightly as she started pumping my dick up and down, I got quite turned on.
I had, many a time, imagined myself feeling up her ass through her normal day clothes in my fantasies, so this was now the real thing.
Again, like last night, not wanting to appear too keen, I gently felt mom's right buttock through the material of her skirt, and then moved over to the left buttock, squeezing the flesh there gently. Her ass felt good.
"Don't crease up my skirt now" she said sternly, still stroking my dick, which was now fully hard.
I widened the circular movement of my hand over mom's ass and wondered if she would let me put my hand up under her skirt and feel her ass through her panties.
I thought quickly and said hesitatingly, "Mom...er...I might cum a bit quicker if I...er... could maybe feel your butt cheeks under your skirt...w..would you be ok with that...?"
She looked back at me for a moment and said in a slightly stern tone, "Yes, if it helps get this over with quicker, but don't crease up my skirt."
The hem of mom's skirt was just above her knee and about level with me as I lay on the bed. I moved my left hand off her ass and ever so slowly slid it under the hem of her skirt, next to her right leg, which was nearest to me, and slid my hand up along her smooth thigh, until I felt the material of her panties. God it felt great, feeling the flesh of her thighs and buttocks!
I squeezed her ass cheeks through the material of her panties as I moved my left hand in circular motions over it, and for a split second slid the tips of my fingers under the panty line so as to feel the flesh there. The feeling was exquisite and my prick raged in response. Mom did not seem to object, although it was only for a split second. I felt like I was going to cum. I wasn't able to last long as all this was so new, and incredibly arousing for me.
"I think that's done the trick mom, I'm gonna cum soon," I said warning her, and with that she placed the semen beaker in position with her free hand and with her other hand which was pumping my dick, pointed my piss-hole towards it.
She did that just in time. As I felt mom's ass cheeks again, I ran my middle two fingers along the material of her panties, down the line of her bum crack and a little way towards her pussy. As I did so, I started to cum, gushing my spunk out, thick and fast. "Uhhh...uhhh...ohhhhhhh.......," I blurted out.
Mom, skilfully managed to catch all my spunk in the beaker, as I felt like I flooded it with my cum.
"Yes, Jacob,....good boy" she said, now sounding a lot happier than when we had started. As I relaxed back on the bed, again, similar to last night, mom, wiped her fingers which had caught a bit of my cum, into the beaker, so as to collect as much of it as she could.
Then, without much further fuss, she said, "Goodness me, that is a lot," holding the beaker up towards the light, and looking how far up the measuring lines my cum was. It was about a quarter full, which did look like a lot as the beaker was quite wide. "Right, I'm going to note down this amount on that form Dr Taylor gave us, and run off to work now. Have a good day." She gave me a quick peck on the cheek and walked out of my room quickly.
"Bye, mom," I said, as she went.
I pushed my head back into the pillows and closed my eyes. Mom's ass had felt great. Wow, it felt so fucking good lying back like this on the bed, with my mom just having wanked me off, letting me feel up her ass cheeks again. I found her butt incredibly sexy. I was a real ass man. I just couldn't wait till the evening. I wondered if I could find a way to add some a variety to our sessions. As that thought struck me, I wondered how I'd pass my day at college just thinking about it! Fuck!