God, it was hot. I had been using my parent's sauna for a few months now, but hadn't gotten used to how damn warm it could get; maybe I never would...My younger sisters Valerie and Suzanne had never used it and my parents were maybe too old to be thinking very hard about health and fitness; they were happy that their son had been spending time using what had been a considerable investment.
I used it 3 or 4 nights a week, after working out at the local gym. It felt great to sit in there in that small, hot room and sweat after working out; really relaxing and solitary. Well...I was single, too, and I'll admit--it was also my favorite spot to masturbate, especially after coming home from the gym all pumped up and with no significant other to come home to; the whole trip in there was so soothing, so relaxing, that over time, it had become a habit.
Then out of the blue, I caught Valerie spying on me. Bitch. There was a 12"x12" opening in the far wall of the sauna where there used to be a vent grate, it was replaced about 2 years before when Dad upgraded some of the vent work. The whole was blocked with a similarly shaped piece of wood, but could easily be removed or simply moved over slightly, allowing someone crouching on the outside of the wall to peek in. And that's exactly what Valerie was doing.
She dropped the freaking piece of wood. There I sat, dick in hand, looking up in horror at my startled sister's face peering through the now-wide open hole in the wall. She had me red-handed, as it were. She put her hand over her mouth and ran upstairs. I was gonna kill her...
How much had she seen? How many times had she seen it? Had she told anyone what I did down there? Man did I have some questions for her. When I finally caught up to her the next afternoon, I was furious. She was really embarassed; she apologized profusely, but didn't answer any specific questions. She broke down in tears at one point; I realized how badly she felt about it and left it at that, after making her promise never to do it again.
I didn't jerk off that night; I went to sleep horny and anxious. Could our relationship ever be the same?
The next few times I sat in the sauna jerking off, I had a hard time getting and keeping an erection...Maybe I was afraid that Val was peeking again, or...a weird thought crossed my mind...maybe it was because I knew she wasn't; she had promised not to ever again and I believed her. This idea intrigued me, so I concentrated on fantasizing about masturbating while Val watched from her hiding place...Instant hard-on. I beat my meat furiously and came long and hard, imagining my sister sitting in the corner watching me shoot my load. Wow...
After a few days I realized I couldn't come unless I was thinking of Val watching me. Part of me thought this was sick, while another part of me was trying to think of how I could make it happen...Surely she would never go for it if I asked directly, my little sister would be completely freaked out by the direct approach, especially after what we had just been through. No, this would take some finesse...
A few days later I asked her if we could talk. I had just gotten home from the gym and was about to go into the sauna; I asked her to join me. I lied and told her it was about our younger sister Suzy and we needed to do it where Mom and Dad wouldn't hear. She looked at me a little curiously and said she'd meet me there in a few.
Once she came inside I immediately dropped the pretense and asked her about her spying. 'You didn't want to talk about this before, Val, and you got all upset on me; I thought that maybe after a few days we could settle this.'
'Tommy, I thought we dropped this! I said I wouldn't tell anyone and I'll never do it again! What more do you want?'
'I want some answers. How many times did you watch me?'
Val was uncomfortable. She squirmed on her bench seat. 'Well...I...I guess two or three times...'
She was still embarrassed, and obviously still feeling a little guilty about watching me. But I wanted to talk this out; get it out in the open. I wanted her to know that I was OK with it; in fact, it was more than OK, I wanted it to happen again. How to tell her...
'Are you sure? Just two or three times? Valerie, don't worry. I'm not embarrassed or ashamed about what I do in here. We all do it. I know you do it. I'm not mad about you spying on me anymore. I just want to know why you watched me.'
Valerie seemed relieved that I was no longer upset about this issue, but still reluctant to speak about it. She finally looked up at me sheepishly and said, 'I don't know...I guess I...It was interesting! Tommy, c'mon...I don't want to talk about this with you anymore.'
I shifted on the bench slightly, moving in just a bit closer to her. 'Please, Valerie. Why did you come back and watch again and again? There must be a reason...' My robe had opened and I spread my legs apart slowly. Val's eyes shot to my groin as the robe separated and slowly revealed my hanging 9"cock and hairy balls. 'You must have liked it, You must've gotten off watching me jerking off...'
Val looked offended and looked away. 'Tommy...Don't do that, Tommy! Why are you asking me this? What are you doing? If you don't cut that out, I'm leav---
'I want you to watch me do it, Valerie.' She froze. 'I can't really explain it, but...knowing you were watching me really...really turns me on.' Val had frozen in mid-stride, staring down in disbelief at her bare feet as she listened in shock. 'Just watch me do it, Val. Just one more time? Please?'
She responded with shock and horror. It sounded kinda phony...'What? You...I can't...I'm not gonna...' she was looking directly at my thick cock. She stammered. I interrupted again.
'It's just watching, Val. No touching! Just watching, and you've already done that! Only this time I want you to do it! So there's nothing wrong with that, right?'
Her eyes danced between mine and my almost fully exposed dick. It was stiffening as I felt Val's resolve softening. My long rod was almost erect and standing straight out from the opening in my robe. She looked up at me and then back to my still growing prick. She seemed intrigued by the way it grew, all by itself...she took a step back, still staring, towards the opposite bench. I could tell by the look on her face that she was rationalizing hard.
'I guess I could... watch, I mean...if you really want me to...I guess I owe you that much. Do you wanna do it right now?' She sounded kind of sad and anxious, as if she were about to do something very wrong and couldn't help herself. I tried to reassure her.
'If its really OK with you, then, yeah, right now. Val, really, it's not...like, evil, or anything! It's just us doing what we've already done; 'cept this time we both know and we're in the same room. That's all!' This was a complete lie. The reason we both got off on this was precisely because it was so wrong. It was so wrong, it was right. As I waited for a response from Val, I stood and removed my robe. My cock was now hard as steel and my heart was racing. Val couldn't take her eyes off of my enormous dick; this turned me on more than ever. 'You've seen this before, obviously...' The way my sister stared at my big cock as if in a trance, looking it up and down, taking in every detail...