Heat it up even more.

Rebecca turned you down yesterday when it almost came to full sex but you aren’t willing to give up the chance of losing your virginity without a fight. You know it’s your sister of course but one time won’t really count and it’s just so that you can know you’ve finally done it.

Still between Heather’s legs, you push your boxer down off your waist and bring you cock back to rub it against Heather’s slit. Your sister gasps in shock at your actions, frantically grabbing a hold of your cock with one hand and pushing against your stomach with the other. You’re bearing down over her so she doesn’t have the strength to push you away completely, just keep you from going any further.

“Even now?” you ask your voice husky with lust.

Heather doesn’t answer but you can see the internal conflict raging inside her. On the one hand, you’re her brother and it’s ****. One the other you two have already been making each other cum and Heather is a notorious slut.

The slut side wins out.

“God damn it! Just fuck me now then,” Heather swears as the resistance goes out of her and you go into her.

Heather knows just the angle she needs you to be as she guides your dick up against her wet pussy lips and between them. Your virginal dick penetrating her loose cunt easily. You drop your body down upon her and start to pump your hips against her creamy box. Heather moaning loud ‘ahhh’s in repetition as she gets fucked by you.

You soon learn where Heather got her reputation for being a great fuck as she writhes herself beneath you. Her pelvis is never still as she brings her hips and slit up against the base of your cock in time with every one of your thrusts. Her hands are grabbing at your ass urging you to fuck her harder and deeper with every one of your lunges. Her legs interlocking themselves with yours so there no possible chance she could lose you and your dick from your body.

Getting a blow job from Heather first might have been the best-unplanned decision of your life as you are sure you would have cum in mere moments of being inside your sister. Her silken pussy is a magical place that tries to trick you into cumming with every movement. Her cunt might have seen it’s share of cocks before and is well broken in but it goes frightfully tight each time Heather orgasms. The first time she does so you are able to prevent yourself from joining her in climax only the greatest of willpower.

The second you have no chance.

“Oh fuck! I’m cumming! I’m cumming,” Heather cries as she takes on a look of delighted agony. Her whole body shaking and spasming beneath you.

“Me too!” you echo. The never before felt sensation of intercourse more than you can handle right now.

“Cum inside me. Cum inside me,” Heather purrs as she wraps you up in her arms and you're locked in place by her legs.

Not a single one of the myriads of potential consequences of cumming inside your sister goes through your head. Instead, you are transported to a different level of consciousness. Your soul leaving your body to mingle in with Heather’s astral presence as you one full minute you exist as a single breathing entity. Your mind travelling back inside your human shell as you delivery the last pulse of spunk at the very bottom of Heather heavenly passage.

The two of you are breathing hard and neither of you wants to be the one who moves first. The choice made for you as your cock starts to shrink back down to its normal size and is ejected from Heather’s womanhood.

“Awwwhhh that’s such a mess,” Heather says in the most faraway voice as you roll off the top of her and onto your back beside her.

“Heather. Oh my God. Thank you,” you say. Trying to put into words the gratitude for what she has just done for you.

“No problem brother. What are big sisters for?” she tells you as her voice begins to take on its normal timbre.

“Oh shit! My sister… Not for that!” you say. Panic starting to blossom now that you can think through what you just did. You came in your unprotected sisters pussy!