I was away at college, but came home for the holidays. I took a shower in the only bathroom to wash off the grime from travelling for the day. When I was in the shower there was some loud banging at the door.

It was my younger sister who at the age of 18 was still living at home. I turned off the shower to ask what she wanted. She said that she really needed to pee badly so I let her in.

I hid behind the shower curtain and could hear her pulling down her shorts and the tinkling of her peeing. I was getting strangely aroused.

Then without warning, I guess as a joke, my sister pulled back the shower curtain. She let out a gasp because my cock was fully erect.

I told my sister that she had to do exactly I said, or I would tell our parents what she had done. She only smiled in response so I knew that she was into it.

I told her to remove her t-shirt, which she did. She did not have a bra on, which nicely exposed her pert nipples and her handful a-cup tits. She was still sitting on the toilet bowl, with her shorts down around her ankles and I was happy to see that she had no tanlines, which made me imagine her sunbathing nude.

I told her to stand-up and pulled her naked body toward me so I could begin to suckle on her morsels of titties. Her breathing started to quicken as I sucked and teasingly bit her nipples.

I licked behind her ears and on the back of her ears, and then we began to make-out vigorously. We explored each others tongues as we started to passionately kissed.

Then I do not know what possessed me to do this, but I picked up a toothbrush that I glanced sitting on the bathroon counter.

At first I decided to play with the handle of the toothbrush. I used the smooth plastic to trace circles around her erect nipples. She quitely moaned biting her upper lip, so I traced the handle down between her breasts, then down further along her stomach.

I then began to trace circles around my sister's clitty as she began to moan loudly. I then inserted the toothbrush handle into her shave pussy, stroking it along her clitty as I began to slide it in and out.

Then I decided to be really daring and start using the toothbrush bristles. I started again at her nipples stroking them with the bristles as she squealed in delight.

I traced the bristles down between her breasts, down to her stomach and belly-button. I then started to stoke her clitty with the toothbrush bristles, as she began to buck and moan wildly.

Then I slide the toothbrush head deeper into pussy and found her g-spot, which I began to stroke with the bristles. This put my sister over the top. She began to scream, her legs convulsed, and her eyes roll into the back of her head. She started to mumble incoherently and then eventually squirted uncontrollably.

My sister could no longer stand and collapsed into a puddle of her own pussy juices. I gave her some time to recover, but now I wanted my own pleasure. I pressed my cock head against her lips, and she began to suck it naturally like a baby taking a bottle. I began to face-fuck my sister as she took my cock deeper and deeper.

With what I had just seen, it wasn't long before I shot a load of my hot cum deep down her throat. My sister swallowed my cum and then appreciately licked any remnants off of my cock and balls.

After this experience, can you guess what I got my sister for a Christmas present that year? An electric toothbrush of course, but that is another story.