Next morning, your parents is out, now your girlfriend/sister and you are have some fun.

In the next morning, you wake up at 7:00 AM as usual, you jump out off the bed and you head to the bathroom to brush your teeth, take a shower, put on your new clothes, and finally go to the kitchen and see your parents are here, so with your 'sister'. "Good morning, sweetie. You wake up so early, are you in such a hurry?" your mom asks as she brings out your breakfast.

"No, mom. Just well,... remind myself that I was ready for school." you explain.

"Well, the school is not yet to open, son. You still have time to spend the whole Summers with your friends." your dad replies. "And another thing, have you met your girlfriend when we were out?"

"Um... n...no not at all, I haven't seen her since you guys told me not to meet her." you answer as you look at your 'sister' and she tells you try not to tell them. "W...why do you ask that, dad?"

"Well, I was wondering if you're getting bored, you could invite her into your house, I wouldn't mind." you dad replies as you both are surprising when he says it.

"Really?" you ask.

"Of course, sweetie. She seems like a nice girl to you, and we're sorry that we've been so hard to you guys. If you are free, you could invite her to our house so you guys can have some fun with each other." your mom replies.

"That's great, thank you, mom dad." you smiles as you look at your 'sister' as she's also happy to hear it.

"Anyway, I gotta go the work, I don't wanna be late like usual. Have fun, kids." your dad responds as he goes off the house and drive to the office.

"Hmm... I think I should need to get more supplies so I could make a perfect dinner, I better go to the grocery store and buy some more. Have fun, kids. I'll be back." your mom replies as she also out of the house. With that, your parents are out of the house now, you feels relief that they haven't found out about this, then your 'sister' hugs you from behind as she smiles at you and says:"Now that's 'our parents' are gone. Let's say like, we enjoy to please each other, shall we?"

"Whatever you say, 'sis'." you reply as you both kiss and make out with each other. During the kiss, you dry-hump to your 'sister' as you both feel the pleasure between brother-sister loving.

"Wow, 'bro'. You're like, such a good kisser. I just hope you, like, enjoy your 'sister' make love with you." your shapeshifting girlfriend/sister responds as she told you to lay back so she's give you a blowjob. As your 'sister'(formerly your girlfriend) starts licking your big, hard cock, she then take a deep throats all in her mouth as you're moaning and feel the pleasure. After that, she suddenly stops sucking it, then you look down and she's trying to give you a boobjob. "I know that these boobies like, in C cups. But I'm like, want them to get bigger like our 'mom'." your shapeshifting girlfriend/sister smiles as you see her breasts are expanding into double size of EE cups. "I like, hope you like big boobs, bro."

With that, your girlfriend/sister is thrusting her boobs faster as you're almost cum. Finally, you couldn't hold any longer, but just cums and release all of your seeds and shoot all over her boobs and face. You sat on the sofa as you're enjoying your girlfriend/sister please you, and you look down to your girlfriend/sister cleans herself and taste your semen. "Mmm, your seeds are, like, not so bad. But now it's time like, to get serious." she responds as your shapeshifting girlfriend/sister climbs on top of you and grabs your cock and guides it to her pussy. You help your sister by sitting up and grabbing her hips to help aim her. With a little more movement you can feel the head of your dick start to spread her little lips.

In one quick shot, your 'sister' sits down onto your rod and gasps. You had to admit she was tighter than the girl you knew as your former girlfriend, but even so she started moving. As her up and down rhythm got faster, you start to suck her boob as she's moaning loudly. Soon you could feel a turning in your balls, and you make your final push towards release. Your sister seemed to be giving signs she was ready to orgasm too. You both sit up a little more while still thrusting and bouncing so you can see eye to eye. While in this position you look into her eyes and the only thing you can see in this cute girl is nothing more than your bratty 'sister' whom you love. With this, the two of you kiss as you explode deep into your sister which brings her over the edge as well.

With the act over, and both of you exhausted, you lay back with your 'sister' still holding onto you. You can still feel yourself inside of her, but neither of you care. "Now that's like, what I wanted from my great brother." your 'sister' smiles. "Let's say we keep it going, shall we bro?"

"If that's my 'sister' wanted, then your 'brother' will always help you with that." you finish as you both kisses each other. Then,...