Robin's "Tired".

It was getting to about 10:30 at night when Robin stretched her arms out in a big, slightly over exaggerated yawn and wrapped them around your neck before looking up at you from your chest.

"Honey, I'm tired. Wanna go to bed?"

This was a lie, she always did this exact move when she wanted to go for some sexy time before bed. You weren't complaining though. You pick her bridal style and head up to your bedroom and place her on the bed.

"So what will it be love? Princess or slut?" You ask.

This was a common question you ask, It was basically asking if she wanted to make sweet, gentle love or be fucked senseless. This way you can make sure she gets what she needs.

"We've done slut twice today, I want Princess tonight."

"That's fine by me" You tell her as you unbutton her PJ top "You know I don't care how we have sex, as long that it's you in my bed."

"I know, but it's still nice to hear it" She tells you as her arms slink around your neck and pulls you in for a deep kiss.

As your lips become intertwined you're not sure how or when it happened but you both become completely naked, your hard on pressed against her stomach. You don't go to move it inside her. When it's princess time, Robin is in charge.

You lie down on top her but as soon as you do she flips you onto your back and climbs on top of you while grabbing your cock and placing it to the entrance of her pussy.

"Gonna ride you until I feel your cum in me." She whispers "I love when you fill me up from below" She gives you another deep kiss before sitting up and dropping herself on to your dick.

You both let out a low moan as you let yourself in to your sisters pussy, Robin even threw her head back as she slowly started to grind her hips against your crotch.

"Mmm your cock feels so at home in my little pussy."

"I know, I love how tight you are."

Robin continues to grind against you slowly and sensually while you just admire her figure above you, still reeling in your new reality. But despite changing reality to have this, you still have all the memories from this new world and you were truly in love with Robin and wanted to give her the best life.

A few more changes would fix that, and no-one would be none the wiser.

Robin rode you for about 10 minutes before your hips buckled up and you sprayed your cum deep inside her sopping cunt. She fell forward and cuddled up to your chest as you instinctively placed a hand on the small of her back.

"I love you" Robin said as she looked up at you "I love you to the end of time."

"And I love you beyond it."

You kiss one last time before you both succumb to slumber, sleeping in each others arms.