* Note: everyone in the story is, of course, over 18 *
It was a Saturday morning. My parents were away on business, due back tomorrow. I'd had a long week of college, and last night I'd been studying hard for my exams. That morning, I'd woken up late, and as usual I had morning wood -- I was a teenage boy, after all. I always slept naked, so I didn't even need to slide my underpants down. I just pushed the covers to one side, stretched out across the bed, star-shaped, and then I took my cock in my hand. I started tugging slowly on my dick, thinking about my mom's friend Trudy. Now, Trudy was not an attractive woman, by any means. She had a slightly overlong face, and intense, severe features. But we'd all gone swimming recently on holiday, both families, and I'd been surreptitiously checking Trudy out in her swimming costume. At this point I liked slim, skinny women, with small breasts and tight bottoms, and Trudy was definitely that. While talking to me in her bikini, Trudy had taken an involuntary glance down at my trunks, as if checking out whether my cock had stiffened in reaction to her. That quick little glance had really fuelled my imagination. As I gently tugged on my dick, I thought about her taking a shower after a swim. I pictured her small tits, erect nipples, and (I imagined) clean-shaven pussy. My balls tightened, I sighed loudly, and I started settling in for a relaxing and (in my judgment) thoroughly well-deserved wank.
And then something happened that changed my life forever.
The door opened.
It was our cleaner, Barbara. She was in her late sixties; a cheerful, weighty woman, with big breasts and an even bigger smile. Barbara had always come on Mondays... somewhere in the back of my mind, I suddenly remembered that she'd changed her day this week. And I'd forgotten. And now, she was standing in the doorway, mouth open. Her gaze immediately locked on to my cock. She gasped.
"Oh my goodness!"
I was so shocked, that it took my brain a moment to catch up. I actually continued pumping my engorged cock for a few seconds, staring at her, before I came to, and scrabbled to pull the covers over my naked body. I could feel my face immediately burning with shame. My cock shrivelled and shrunk.
"Oh god Barbara, I'm so sorry. I've got no excuse."
Her mouth kept the O-shape for a few seconds, then she laughed. It caused her big breasts to jiggle, and she smiled at me warmly. "Oh don't be silly. I was just surprised! You're a young man, with all of those physical urges young men have. I'd be more surprised if you didn't have a good wank every day."
Hearing her say the word 'wank' was really quite arousing. I felt my cock tentatively stiffen again.
"I... I guess so. But still, I'm really sorry you had to see that."
She laughed. "See what? A handsome young man naked, tugging on his lovely big willy? Believe me, that was the highlight of my week!"
My cock stiffened even further at this, now approaching its full length.
"I... you.... You really don't mind?"
"Darling, of course not, I don't mind at all. We all do it! Even at my age, I like to give myself a good rub down there every now and then."
I pictured her touching herself, and the image, to my surprise, caused my cock to viscerally ache. She was still flashing me her warm smile.
"Now -- my late husband used to say that there was nothing worse than stopping mid-wank. He said it gave him something called 'blue-balls', whatever that is. So why don't you carry on, darling? Don't stop on my account."
She reached up to the top of my wardrobe, and started dusting. My eyes ran over her big bottom, as my mind raced. Was she seriously saying I should carry on wanking? Literally in front of her?
It all seemed a little surreal. Nevertheless, I started lightly stroking my dick under the covers, while I watched her clean. She wore one of her usual flowery dresses -- not too tight, but it didn't do anything to hide the shape of her body underneath. She had little 'love handles' at her waist, but most of her extra weight was around her hips and bottom, and of course her huge boobs. I suddenly realized I found her really erotic. Really sexual. Her dress was low cut around the bosom, exposing a fair amount of cleavage, and with the morning sun streaming through my window, I could see through it -- not fully, just slightly. Her bra was lacy, and expansive, and she wore a pair of what we used to call 'granny panties', which covered her entire ass. I wondered what she looked like naked, and as the images flooded my mind, I started tugging on my prick again. By now, it was once again fully erect, and I adjusted the covers to create space.
She glanced over at me again, and smiled encouragingly. "You know, you might as well pull back the covers, it'll be easier."
I stared at her. "You... you really think I should?"
She laughed. "Only if you want to, darling! But I've already seen your equipment, and I've seen you working on it. It's not like I'd be seeing anything I haven't seen before."
I thought about this. My cock was literally aching now. And I had to admit, now that I'd gotten over the initial embarrassment, the thought of her watching me wank felt really erotic. Still in a half daze, I pulled back the covers, tentatively, exposing my dick and balls to her. She smiled, encouragingly. "That's it! Now you can take care of yourself without all those covers in the way." I took my penis in my hand, and started tugging gently as she watched. She smiled even more broadly this time, putting her hands on her hips. "Go on luv! Don't be shy! Give it a good blast!"
I laughed, nervously. Then I looked down at her huge tits, and started wanking faster. She smiled at me, seemingly entirely at ease with the attention.