Sister Was A Heavy Sleeper

Growing up my sister who is 4 years older than me was a notorious heavy sleeper.
The family would joke that a bomb could go off in the room and she wouldn't wake up.
She would often take naps on the couch and we couldn't wake her up so we would move her to the floor so people could sit and she'd sleep through it.

Well, around about 13 I was sent by my mom to go try and wake my sister up for something. We were running late.

I go down to her bedroom that was in the basement (finished basement) and go in her room. She's sprawled out on her bed in her underwear and a tank top.
At first, I try to do what I am sent down there for.
I call her name. I put my foot up on her bed and shake it. I poke her in her arm. Nothing. Snoring.

Now being the perpetually horny teenager I can't help but look at her tits. She had a pretty flat chest, A cups, but that didn't matter any to me.
Like a silly kid, I poke her in her boobs a few times. No reaction.
Now I'm getting hard.
Then, getting a little braver, I put my whole hand on one of her tits. Just holding it there. I remember screaming in my head 'Holy shit I'm touching my first boob!' Lol.
I kind of move my hand around and pinch it some, while watching her face the whole time.
Then I'm touching both her tits over her tank top.
My heart was pounding. My little cock was so hard.
Then I get up the nerve to slip my hand under her tank top.
And oh my god the feeling of her warm smooth skin, I felt her nipple in my palm. I almost came right there.
But then she moved, I panicked, and bolted out of her room. In hindsight I can't help but laugh. So skittish.
Told my mom I couldn't wake her up so she went down there instead.
I ran to my room and jerked off.

After that, I couldn't get it out of my head. I had to do it again. I became obsessed.
One night I couldn't sleep. I was up late jerking off thinking about her. I got the wild idea to go to her room. My room was upstairs and I remember the seemingly long walk in the dark down to her room. Feeling so excited and scared of getting caught.

I slipped into her room as quiet as I could. She kept a string of lights on in her room at night and had her radio playing. She was on her side with the blanket pulled up. I tested her again. Shook the bed a little, poked her on her back. No response.
I pulled the blanket down some. She was in another tight tank top. I reached over her shoulder and felt her tits again. Oh it was so good. It was an awkward angle so I slowly pushed her onto her back.
Then I put both my hands down the front of her shirt. Her delicious perfectly hand sized warm tits felt so good. Her nipples hardened. I rolled my fingers around on them.
I couldn't take it and pulled one hand out and shoved it down my pants and jerked myself as I touched her.
I came pretty quick and then left.

But I started doing this more.
Almost every night.
I worked up to pulling her tank top up so her tits were out.
I sucked on her nipples.
I kissed her lips.

I tried to touch her between her legs but each time I would try that she would move or stir and that scared me enough that I stopped trying it.

I also started cumming on stuff in her room. In her laundry basket, on her hairbrush, under her bed.
I came in my hand once and rubbed a little on her lips and that made me instantly hard again.
It took me a long time (like months) to work up to pressing the tip of my cock to her lips. Sliding it back and forth. Lightly parting her lips just a little with the head.

I was getting brave. Maybe too brave.
I came on her one night. Sprayed my cum on her bare tits and up her neck.
She kind of woke up then. I panicked.
Pulled my pants up and scurried to the door but didn't go out. I just crouched there and was quiet.
She wiped her face, half ass adjusted her tank top, then rolled over and was quiet again.
I was so scared. I waited a long time to leave. To make sure she was asleep again.
That time spooked me pretty good. I stayed away for a bit. A bit later she joined this thing with our church and started spending a lot of nights at the house of a new friend she met through that.

I think I developed a kink from all that. I like watching sleeping groping porn and I've asked girlfriends to pretend to be sleeping while we fool around and have sex.