Need help with this girl problem!

This girl is 14 and im 18. Shes cute and has a nice body, her appearance is very mature and she has long light brown hair. We live together since my dad lives with her mom. We lived together for about a year and i think she started liking me about a month after we met. She kissed me around that time and told me she liked me alot and i told her its sweet but we can never be together because of our age gap and she said why does it matter to me so much and i told her im not a pedophile. Its funny because shes actually taller than me im 5'6 and shes 5'9 and i havent even grown my beard yet so i look like im 16. She acted like she understood but ever since then shes only been coming on harder. She sneaks kisses, pushes her breast up against me when were both in the kitchen, bumps me with her ***, sits very close to me, sleeps on my shoulder when our parents take us to the movies or if were in a long cab ride and she knows i cant push her off because our parents are right there, she takes my stuff and runs in her room so i have to go in there and she hides it so i have to look for it, and she watches me i and stares sometimes. Its hard to avoid her since we live together and truthfully i havent been trying that hard to i mean sometimes it feels natural until i remember her age. When she does get me "excited" it drives me crazy because i stopped jacking off (i used to be addicted to porn) so i just sit or lay there trying to hide my hard on when i sleep. I know i cant stop getting hard ons lol or stop her from doing what she does because she does it so sneaky that if i was to tell her to stop i would sound crazy. I know she wants me to break and give in, but sometimes i think i get very close to slipping up. What can i do in this situation? I dont really want to tell our parents because it would make everything weird and probably ruin their relationship. Would it be so wrong to do it with her just once? I mean she is bigger than me?

I would honestly be worried about the repercussions from the law. It's not that I agree with the law in every given situation; at times it does protect better than others. It's mostly that I wouldn't want to risk messing around with it anyhow because some awful things could be stuck on your record. It wouldn't necessarily be wrong that you really liked each other as long as it's not just physical. You say she is cute and has a nice body; well, make sure that's not the basic, underlying motivation. She doesn't see something wrong with her behavior, and it sounds like you are fighting in your mind whether or not you want to cave in to her in a purely physical way or experience actual validation and acceptance. I think that if the parents find this union acceptable, you could be together, really. These relationships with strange age gaps can thrive with the acceptance of loving family and friends who do not want to act as a threat to a good relationship. Hope this helps.

She really likes you and wants 3 things: 1) For you to not get caught up on the way she looks, 2) For you to not let age get in the way, 3) And to really experience LOVE more purely, beyond all that, with you. I feel like she is not quite saying that, but that is what all her actions are about. I think if you would like to go ahead with this relationship, make sure you have a circle of support and do not go without including the parents, because they might exercise the law if they disagree with you being together.