Lisa was laying on her belly, legs up in her panties---about all she wore unless she went to the kitchen----<br/>The 16 year old brunette had her laptop open and chatting with a friend when her younger sister Cassandra came in.<br/>The two girls had their share of petty differences and even fights---shit, what pair of sister didn't?---<br/>but the two were inseperable and quite fortunate when  woman announced she wished to adopt them.  For the two teens, it was not only a dream come true, but a ticket out of the Orphanage.<br/>Their new mother wasn't exactly wealthy but did have the financial resources to buy a decent sized house, giving the girls their own bedrooms.  Both girls quickly came up with their own 'rules'.....for example, if Cassie didn't knock first Lisa would ignore her until she did, but often even that was ignored.<br/><br/>"You want to do WHAT with me??," Lisa asked, startled, rising up from the bed and exposing her tits.  Both girls were straight although Lisa did have her fair share of fantasies with girls.  That was the extent of her exploration, that is, until Cassie came in with her strange request.<br/>Sure, they kissed but never on the lips, always those familiar cheek pecks that family members always do.<br/><br/>"Uh, better get back to you later," she said to her Facebook friend.  "Something.....uh, something just came up...catch ya later."<br/>She closed down her laptop and patted the bed, sitting upright.<br/>"I think you better sit and tell me what your'e talking about..."<br/>After her sister explained, Lisa shrugged.  "Well, I guess it's a harmless question.  Well, when you kiss, press your lips tight on his like you mean what your'e doing.  Also, guys love girls that can french kiss....you know, putting your tongue in their mouth and all that...."<br/>It wasn't as if Lisa was an expert but she took her sister's head in her hands and locked lips with her....<br/><br/>SOMETHING HAPPENED.....<br/>It felt like static electricity shot through her.  Who would've thought Cassie's lips would taste this good???<br/>"Now," she said...."stick out your tongue like this...."<br/>They locked lips once more and Lisa became infatuated....all the years they've been sisters, Cassie had never felt like this....so warm, so soft....<br/>Lisa pushed her sister down on the bed, wrapped her arms around her and kissed her with a passion that scared even her....