You enjoy Randall's show, taking the opportunity to finish jacking off.

Sitting there, frozen in your chair as your mother stuffed one of her large breasts into her mouth and started sucking and pulling on the thick, dusky brown nipple with her lips, you found yourself unable to look away, or do pretty much anything but watch in utter disbelief and shock as your penis began to physically throb.

This was wrong beyond words - sick even - what Randall was now doing in front of you in your own mother's form, and the very fact that you were actually becoming aroused by this was even worse! This was your mom! Your own mother who was now standing there in the corner of your room, enthusiastically mauling at her own tit! ...Her huge, big, soft and juicy looking tit, with those long, suckable nipples...

"Oh God!" you gasped, suddenly feeling more turned on than you ever had before - the depravity and shame and wrongness of this whole situation (added to the fact that you were actually watching a very large breasted woman doing something you'd only ever seen done in porno movies before) somehow mixing with your arousal and lust to make the feeling all the more powerful as you felt your hand grasp your dick, unable to control yourself.

Randall meanwhile continued sucking away on his right boob while his fingers teased and pulled at the free nipple, stretching it and your mother's mound out into a almost conical dome like shape, before letting it snap back and jiggle and wobble around on his chest. With your hand now working your rock hard member again and your eyes locked on the point where creamy smooth skin met the bumpy dark surface of your mother's areola, and where that in turn met her powerfully sucking lips, you couldn't help but notice as Randall's eye (that had previously been closed) flickered open and looked upon you and a wide smile then made its way across his busy mouth. While he was clearly enjoying the fact that you were watching him and jacking off to his little show, presumably getting some sort of thrill out of being the cause of arousal for once (even if it was with his best friend), you honestly weren't really paying him any mind - having long forgotten it was Randall in there, and simply focusing on the hugely perverted, yet erotic fact that your mom literally sucking on her tits for your pleasure.

You never imagined something like this could be such a turn on, but it was. Your mom while always just 'your mom' to you was admittedly rather pretty you supposed for a 40 year old (especially according to Randall and your other friend's), and she really did have the most amazing pair of tits. You honestly couldn't believe how incredible they looked, or how big - being aware of course on some level that your mom was large chested, but never really having consciously thought about it before...especially not about the fact that they were clearly much, much larger than a lot of the 'big breasted' models you were obsessed with on your computer (having really been too young that time you caught a glimpse of her bra to properly notice). This was why seeing her now like this, doing something so overtly sexual to the very breasts that you used to feed from as a baby - this kind, loving, compassionate woman who you'd never even imagined before actually ever took her clothes off - was so God damn kinky and hot that it almost felt like your eyes were going to pop right out of their sockets and you were gonna snap the dick that you were frantically pumping clean off!

"Mmm. Looks like someone likes watching his mommy suck on her big fat titties," Randall chuckled, still with a mouthful of breast as he again looked over at you, snapping you momentarily from the illusion and reminding you once again that this was your best friend. "And believe me, it feels fucking awesome too!"

You didn't reply, finding it all too weird and embarrassing, and instead just tried to block out the sound of her...of his voice, feeling your impending orgasm grow as your eyes focused now on the hand that was now sliding its way down your mother's slightly padded but fairly slim (considering her age) torso, towards her crotch, where it began slowly moving its way back and forth...

Well this was about as much as you could take - having your topless mother with one huge breast stuffed in her mouth, devouring it like it was the sweetest, most delicious thing in the world, while her free hand stroked away at the patch of material between her legs, beneath which her vagina lay - and letting out a grunt, you felt yourself explode and began spurting all over the floor, unable to control yourself.

Letting out a few short, sharp breaths, realizing what you'd just done, you looked up again at your mother's face as Randall then released the glistening, saliva soaked nipple from his mouth, letting the large mound slap against his chest and said, "There she blows!" chuckling a little at his own joke.

"Well, I think that more than makes up for me walking in on you, dude," he then told you as he bent down to pick up his bra and blouse (causing his huge mounds to dangle beautifully as he did), "I don't know any other friend's who'd let you watch them play with their boobs while you whack yourself off - especially not such a massive pair as these!" Though he was right and it had been one of the most amazing sights you'd ever witnessed, now that it was over and you were left sitting there watching as he stuffed his big breasts back into their bra, you felt incredibly guilty and almost sickened by what you'd just done, and you could barely even bring yourself to look him in the eye as he continued chuckling away. "Now you know what mommy Randall does every night in the mirror before bed. And every morning when he wakes up. And...well, just about every freaking opportunity I get if I'm honest. Heh-heh."

Hearing this didn't exactly make you feel any better about things though, and with your mom's boobs now once again hidden from view, you quickly turned your attention towards your own exposed member, cleaning it up as quickly as you could and stuffing it back into your pants in shame.

"...I guess I'll leave you to get cleaned up then," Randall said after a moment, obviously expecting some sort of thanks, or reaction from you of any kind but not getting it, adding a little awkwardly, "You can, uh, thank me later, dude."

And with that he turned and left, closing the door behind him, leaving you to reflect on not only what you'd just done, but on how good it felt while doing it - the guilt and shame you now felt being unable to mask the positively overwhelming erotica of seeing your own mother topless, playing with her breasts for your pleasure...