Get creative.

From your position beside Heather, you roll yourself so that you are lying on top of her. Heather’s legs open wide to accept you as you press your body down on top of her.

“Is that the only thing stopping you?” you ask as you again press the tip of your cock against the entrance to her pussy and spread her lips with the cotton material.

Heather’s eyes roll into the back of her head as she can only say, “yes,” to you with your dick so close to ramming inside her.

“Fuck,” you mutter back, lust the driving **** behind your emotion now, wanting with all your might to be able to slam your cock inside Heather regardless of you being related or not right now.

“We have to do something,” you say not know what to suggest though.

“Let’s try this,” Heather says as she starts to wriggle her way down the bed underneath you.

She continues to crawl lower until her head is level with your abdomen, then starts to tug your boxers down off your waist. Your cock pops free, spring up before her eyes.

“Don’t be too rough,” she tells you as she takes your cock in her mouth once again, lying back down as you start to slide past her lips and down her throat.

Heather has positioned herself in such a way so that you can use her mouth. You try and support as much weight off your hips but at the same time thrust yourself in her willing mouth. The feeling is a little rougher than the other blowjobs you’ve received before as you are basically fucking your sisters face this time.

Heather has some obvious skills in sucking cock as she is able to take a good length of your cock down her throat with each thrust of your hips. You try and take it easy on her but soon hear her gagging and **** on your shaft as she grabs a hold of your arse urging you on.

You bury your face into her pillow to muffle your moans and cries as you pump yourself down her throat. You draw close but the awkwardness of it causes your vinegar strokes to last a good minute before you tip over the edge and start cumming down Heather throat again. Close to a minute your sister took every last inch you had, deep throating you the entire time before lift your hips off her face and just letting her suck on the tip as you come. Heather massages your balls in one hand as she moans, her lips sealed tight around your rod as she milks the juice from your nuts. Your sister doesn’t spit a drop as she swallows every last squirt of your load for the second time in a row.

Rolling off her as you are done with your second orgasm for the night, Heather again comes up from under the sheets. Her eyes are run with tears but she doesn’t seem in the slightest bit upset. In fact, she is radiant as she hugs you tight once again.

“That wasn’t too bad was it?” you ask concerned you might have hurt her in your passion.

“No it was good,” she tells you, “your just a bit on the bigger side that I’m used to.

“Really?” you ask chuffed to know you might have a bigger cock that whoever it is that your sister has been messing around with.

“Don’t go getting a big head now or anything,” Heather tells you as she playfully smacks you in the ribs. “We don’t know if you can use it or not yet.”

You desperately want to know what she meant by ‘yet’ just then but decide now isn’t the time to go asking after what the two of you just shared together. You know you should really be getting back to your own bed without Heather having to tell you after a few more minutes of cuddling together. Heather climbs out of bed with you, her nightie having bunched up around her waist in all the action. She slides it off her body and bends over naked in front of you to go looking for your boxers that you lost inside her bed. As she searches you can’t help but step in behind her, your softened cock nestling between the cheeks of her arse in a standing doggy style position.

“Cheeky,” she tells you as she finds what it is, she’s looking for. Giving the underwear to you, your sister hugs herself to you naked one last time before kissing you a long and lingering goodnight. You step back into your sleep trunks before making your exit from Heather’s room and back to your undetected.