As Susan got closer to the upstairs bathroom, she slowed down and grew more careful. Now, I can’t just go barging in there, tits a-blazing. I’ve been a shameless cock hog lately, and Angel in particular has been getting the short end of the stick. Admittedly, it’s a very long and thick stick... - she chuckled to herself - ...but she’s still not getting enough of it. So first, I should scout around, and if she’s taking good care of our master, I’ll just leave them be.

After checking both of their bedrooms, she quickly determined they had to be in the shower together. She stood in front of the closed bathroom door, wondering what to do. Hmmm. If I’m a good mommy, I’ll just go back downstairs and wait for Tiger to come down. That’s what an obedient sex slave would do... On the other hand, Tiger says he likes his slave mommies to be a little bit uppity. Besides, I just have to see that big fat cock of his! Maybe if I just open the door a little bit...

Abruptly, she pulled her hand from the door. No, I shouldn’t. I need to be strong, and not some interfering pest.

But as soon as she did that, she heard screaming coming from inside the bathroom. It was Katherine’s voice. "Help! Help me!"

Fearing that her daughter had fallen and hurt herself, or something along those lines, Susan barged in. However, even as she did so, Katherine continued, "Help! My brother is threatening to fuck me, and it feels soooo good!"

Susan’s heart was in her throat, and it took some long moments for her body to realize there was no need to panic. Thank the Lord! She’s okay! After a few more seconds, she realized they hadn’t noticed her open the door, and she took a look around the room.

The shower curtain was closed, so all she could see were blurry shapes of bodies. However, what she saw was enough to mollify her. It was hard to tell, but it looked like Alan had Katherine pinned up against a wall (facing away from where Susan was), and was rubbing his dick over her ass.

Susan was quickly able to confirm this last part, because Katherine was still pretending distress. "Help! Brother’s sticking his cock everywhere but in my hole, where it belongs! Somebody help! Help him guide it in!"

Katherine giggled. She suddenly turned around, however, and told him, "If you’re not going to rape me properly, I’m just gonna have to take matters into my own mouth." She suddenly dropped to her knees.

YES! Susan silently pumped her fist into the air as she salivated and licked her lips. Go, Angel! She could see that Katherine was bending her head forward and starting to give Alan a combined titfuck and blowjob.

Susan felt a great sense of relief, just from knowing that her son’s dick was being properly taken care of. She didn’t have a good view, because of the shower curtain, but she could see enough to confirm that Katherine’s head was bobbing up and down in a tell-tale motion. That’s it, Angel! That’s it! Choke and gag on your brother’s massive cock! Don’t be afraid to encourage him to vigorously fuck your face!

Susan was startled when she heard Alan speak, but then calmed down when she realized he was talking to Katherine.

He said, "I told you that’s completely unnecessary, Sis. I mean, trying to make my dick hard right now is like trying to keep the sun up in the sky. It’s already there, and doing fine!"

Katherine pulled her lips off his shaft and giggled again. "I know that, Big Windex Bottle Brother. But humor me, okay? And then you can go down on me."

He replied, "Hey, I’m the master here, aren’t I? And I say I want to go down on you right now."

Katherine moaned lustily. "If you insist! I love it when you play the master card. Go for it! But then remember that it’s gonna be MY turn."

Susan found herself slowly drawn deeper into the room, like a moth to a flame. She moved silently, and Alan was facing the other way, so there was little danger at the moment of her being detected. She stood still as a statue when Alan and Katherine changed positions and Alan got down on his knees in front of his sister. (Of course, there was no real danger if she got "caught" by either of her children, but she’d gotten caught up in the situation and was quite nervous. She just didn’t want to be seen as a "cock hog" trying to elbow in on their private time together.)

Unfortunately for Susan’s stealthy efforts, Katherine was now directly facing her, and Katherine could easily see the flesh-colored, Amazon-sized figure on the other side of the curtain. However, she wasn’t alarmed in the slightest, since she could make out Susan’s unusually voluptuous shape and long dark brown hair. She could even make out Susan’s black collar.

If anything, Katherine was amused. Sweet! Mom is spying on us, and buck naked to boot. How cute is that? She crooked her finger, motioning Susan to come closer.

Susan poked her head through a gap in the curtain, but only did so because Alan still was kneeling away from her.

Mother and daughter communicated with each other using non-verbal gestures and exaggerated faces while Alan continued to lap away at Katherine’s pussy, oblivious. Katherine "asked" Susan if she wanted to join in, but Susan was very determined not to cut in, and made backing away gestures with her hands. So Katherine went back to enjoying Alan’s oral work, while Susan grew hot as an oven playing with herself and watching through the gap in the curtain.

Alan kept right on licking Katherine through a big (and loud) orgasm.

As both of Susan’s children started to recover from that effort, it was clear that Alan was about to stand back up. Susan knew that the odds were good that he would see her, especially since she was standing right next to the shower. So she silently backed out of the room and closed the door behind her.

Why did I do that? Susan asked herself as she leaned against the door, recovering from the excitement. I’m terrible! I just can’t get enough of my son and his glorious cock! The problem is, I’m even MORE horny now. Instead of getting my "fix," I want him twice as much.

She sighed. Ah, well. Such is the fate of being a big-titted sex slave mommy to a son with a big harem. There’s just not enough Alan Junior to go around... Gaawwwd, that fact alone is so HOT! Even thinking about how my son has so many other women to fuck that he’s forced to leave me deprived sometimes totally turns me on. And is it possible to say "big-titted sex slave mommy" too many times in a single day? I think not! She chuckled at that.

Still, big-titted mommies do have other duties. Those two will have worked up a sweat, and they’ll want to eat a big breakfast in a very short time. And since Angel got him all night, maybe she’ll let me have a turn slurping on his fat knob? Oooh! I might even get to do it under the table while he eats. That’s my favorite!

I’d better go put on some more clothes, because if I keep running around naked like this, I’ll be too horny to cock. Er, I mean cook! She headed towards her bedroom.

At the same time, back in the shower, the two siblings were busy kissing and fondling. After one particularly long kiss, Alan said, "Kat, you smell so good, and you feel even better. How are you doing? Are you up for a shower fuck, or are you still a bit wobbly from that orgasm?"

"A bit wobbly, actually. But I have an idea. Think about Mom."

"That’s your idea?" he asked in confusion.

"No, silly. Think about what she’s doing right now. You know she’s up long before us, working hard to keep the house clean and all of us well fed. I’ll bet she’s totally chomping at the bit, listening to the sound of the shower running and pretty much counting the seconds until you come downstairs and ’get her attention.’ In fact, I’m surprised she was able to resist the urge to sneak in here and spy on us." She said this last comment as a little joke to herself, since of course she knew full well that Susan had done just that.

"So you want me to go downstairs and fuck her? That’s pretty selfless of you."

"Well, yeah, kind of, but not really. I’ve got a plan forming in my mind that’ll involve you having anal sex with me, as well as her." It was seeing Susan sneaking into the shower that had put the thought in Katherine’s head of doing something to please her. She knew that Susan was even more aroused than usual (which was saying quite a lot!), so whatever they tried was bound to be wildly successful.

Alan asked skeptically, "Anal sex with you? But we tried that before, twice even, and I thought you didn’t like it."

Katherine just rolled her eyes at him, as if he’d just said something stupid. "I think you got the wrong idea somehow. It’s not like I hated it; it’s just that it doesn’t make me see stars like it does for Mom. Normally, if you’re gonna fuck me, I’d rather you fuck me in a different hole where I’d enjoy it more."

She nodded towards her shaved mound, in case he didn’t get the hint. "But not today. This’ll be a key step to help ensure Mom has her brain completely blown out of her head. She’s been so good to us and, thanks to her selflessness last night, I got to experience a whole body orgasm with you. So I really want to make her day."

She then leaned in close and spoke to him in hushed tones. "We both know that Mom REALLY gets off on anal submission to you. She still thinks of it as THE most ’sinful’ and humiliating sex act there is."

"She does? But she and I had anal sex long before vaginal."

"I know, but that was before her old, prudish belief system was overturned. Now, she thinks all sex acts are delightfully naughty, and gets an erotic buzz out of the ’sinfulness’ of whatever you do to her, but anal seems the most ’unnatural,’ so that give her an extra big buzz. Yet you hardly ever poke her back door. That needs to be rectal-fied right away."

He groaned at her "rectal-fied" pun. But his heart also started to pound as he imagined what Susan’s reaction might be. He grinned with anticipation, as he imagined his mother bent over and eagerly wiggling her ass at him. Just thinking about her luscious ass being willingly offered up to him made his dick harden even more and throb with anticipation. "Okay, I’m up for that. Let’s blow her head off!"

"Sweet!"

After Katherine explained her plan, she hustled him out of the bathroom, and told him he should wait in his bedroom while she took care of some necessary "feminine things" before they went downstairs.

He didn’t ask, and didn’t want to know what that meant, but she was just lubing up and otherwise preparing her own ass for anal sex.

Downstairs, Susan was chopping up bananas to put into the banana pancakes she was about to make. She was dressed more like a porn star than a soccer mom. Her miniskirt didn’t even cover the bottoms of her ass cheeks, and her milk-filled breasts were constantly falling out of her extremely loose and low-cut top.

But still, she worried about being too covered up and wondered if her erotic apron might be better.

Any minute now, Tiger and Angel are going to come downstairs. Will he be feeling frisky? Will he be erect, even? Will he be naked? What if Angel will have just drained him completely dry? Then I’ll look pretty foolish dressed like a shameless hussy. But that’s okay. Part of being a big-titted sex slave mommy is getting humiliated. To be honest, I kind of like that part. As a matter of fact, I like it a lot!