Ok so I'm a 22 year old guy and I live with my 21 year old girlfriend. My girlfriends older sister lives a few doors away and she has a 13 year old daughter. For the last six months or so the daughter (beccy) has been spending a lot of time round our house.to the point where everyone has started saying that they think beccy has a slight crush on me. I usually laugh it off but she's really starting to push the bounderies now. She's constantly looking at me and a few times I've caught her looking directly at my trouser area. When I've caught her she looks me in the eye and gives me the biggest smile.

Now I'm a red blooded male and I've stared to take notice of the way she acts around me and the way she looks at me. She's very slim but from the clothes she's wearing I can see just how much she's developed. Let me say right now though,I'm very happy with my girlfriend and I'm also not stupid enough to do anything with beccy but OMG she's testing me and teasing me so much now.

The other day she was doing showing me some of her ballet and dance MOVES and she was deliberately bending over in front of me with her cute little ass inches away from my face. After a while she came and sat on my knee. Then she did something that totally shocked me. She said that my knee was too boney and took my hand and placed it on my leg palm up then sat back down on my hand.

My hand was now cupping her pussy. For a few seconds I left it there, more in shock than anything else. I then pulled my hand out but she looked at me with sad eyes and told me to leave it there. I didn't...

A few days later she walked in our house. I think she knew I was alone. She asked if she could use our shower because hers wasn't working. I said no and she should wait till my girlfriend is home as it's not really right.

She went back to her house, I don't know what she said to her mum but a few minutes later I get a call from her mum asking if I mind if beccy uses our shower as she's going over to her friends later and that their shower don't work so I agreed.

So there we are. Our shower is downstairs, I was in the kitchen getting a coffee and beccy comes out the shower wearing one of my tee shirts she had found in there. She asked me how to run the shower so I went to walk in to show her when she bends down in front of me and shows me her bare ass and pussy.

I pretended that I hadn't seen anything but I think that pushed her further cos then she turned round and pulled my tee shirt off and stood naked in front of me. I was instantly turned on and she quickly noticed.

I led her into the shower and jokingly said that she shouldn't be doing that and told her to get on with her shower. I shut the door and walked away. After a while I heard her leave the shower. She called my name and I turned round. Again she stood naked in front of me but this time she threw her arms round my neck, pressed her beautiful young naked body against me and asked me right there if I would like to lick her freshly washed pussy and then she would suck my obviously wanting cock.

I looked at her put a towel round her and asked her to get dressed. But OMG how much have I dreamt about sliding my cock in that sweet looking pussy. How the hell I've kept the strength to resist her is amazing. My only worry is what she might try next. And how and if I should tell her mum..