"Yes, because I love you, sis. I always love you, and I always will be with you forever. But if our parents find out about this, we-" when you almost finished your sentence, your sister moved toward and give you a fresh kiss on the lips. "Don't worry, we'll figure it out together, right now, let us enjoy our vacation. And I'm just glad you say 'yes'. And I love you too, big bro." she said with her tears and smile on her face.
After both of you finished your dinner, you two decided to go back to your room and kissing each other. During the kissing, you and your sister strips off all of the clothes until you are naked. Once you were naked, you broke the kiss and moved down to her breast, taking one in your mouth and the other in your hand. As you sucked and squeezed, you could hear the soft moans coming from your sister, and this only turned you on more. "Take me, brother. Take me as your lover." And with that your sister leans forward just a little and directs you rod into her awaiting pussy. Once contact was made, she leans back onto your cock taking the whole thing in.
Both of you gasp at the feeling, as you are now completely inside your sister. After settling a little, she begins to move up and down rhythmically. Soon after this she speeds up more, bringing you to move your hips with her. As your both start to feel a building feeling, you sit up and grab her hips making her go even faster. With the newfound speed, your sister finally hits the spot and forces you deep inside of her where you finally explode. You hold her tightly against you and kiss her gently as you continue to release your seed deep within your sister.
Both of you exhausted, you fall to the bed and continue to kiss. After a time you pull back and look at the girl you can only think of as your sister now. She smiles and breaks the silence. "This is gotta be a great vacation to us, big bro. Why can't you be that wild when we are at home? Or are you afraid of our parent and neighbors finding out just how much I loves you?" "Hehe" you laugh as you reply, "Well, let just say this is a secret between us, that's all. I hoped you like it, because we still have a whole vacation ahead of us." Your sister smiles again and the two of you go back to kissing. Somewhere deep in your mind you know things probably can't stay like this forever. "Sis, I have something for you." "What is it?" she confused when you ask her, but when you kneel down and show her a ring and say. "Will you marry me?" Your sister surprise and about to cry. "Y...yes, absolutely yes!!!" she excited and give you a kiss.