Some questionable advice.

“Well just keep doing what you're doing and she’ll be ready soon. Eat her out like that and make her cum and she’ll want to fuck you in no time,” Heather tells you.

“I got her to cum today for the first time,” you say letting Heather know about the heavy petting session you guys had in the car at school.

“High five Bro!” Heather congratulates you as the pair of you slap hands together above you. “I’ve done it in that car park before too,” she admits. “You carry rubbers with you just in case, don’t you?”

“No. I don’t have any,” you say to Heather questioning.

“Wait here,” she tells you before climbing up off the bed and making a dash to her room.

Heather returns a moment later with an already opened box of condoms. Probably the ones she was using with Kyle earlier.

“Here you can have these. Kyle won’t be needing them again that’s for sure.”

You take a little moment of joy at the thought of your sister no longer doing anything with that guy if he’s not going to bother taking care of her needs. You pull the condoms out of the box and count up that there are nine remaining still from the original pack of ten. Heather and Kyle must have only just got them for today.

“You know how to put them on right?” Heather asks you after watching you play with the condoms for a bit.

“Yeah. I mean kind of,” you say.

“Here let me show you,” she offers, taking the roll of condoms from you and tearing one off. “Take your pants off.”

You hesitate a moment before Heather offers to get undressed too. Pulling her shirt off over her head you take in your sister's naked body in the daylight for the first time. She is actually very attractive from a purely objective point of view. As you slide your boxers off, you’d be lying if you said your cock wasn’t already quite hard from going down on your sister before. It throbs a couple of times in the cool air.

“Now you put it on like this,” Heather says as she goes through the process of rolling a condom on.

She takes your cock in her hand and strokes it a couple of times making sure you are good and hard. Satisfied you are sporting a big solid wood, she tears the packet open and takes out the rolled latex sheath. She tells you to pinch the tip and make sure it’s the right way around before placing it over the head of your cock and rolling it all the way down to the base of your cock. The effect of the rubber ring around the base of your shaft makes your prick pulse and fill even fuller with blood.

“And it feels just like normal with it on?” you ask.

“Yeah, well mostly. Maybe not quite as much as without,” Heather says before stopping to think for a moment.

“I’ll show you what I mean,” she says as she throws one leg over your waist and straddles your groin, your condom covered dick in her hand.

You grab her hips in reflex stopping her from moving any further. “We can’t,” you tell her urgently, worried about what she’s about to do.

“Relax brother. It doesn’t count as sex if I’m just showing you something. I’m just going to put the tip inside,” Heather says soothingly as she lifts herself up over you and places the head of your cock against the entrance to her pussy. “See,” she says as she lowers herself down onto you, just the first two inches of your cock inside her pussy.

Where you are inside her you feel such incredible warmth and tightness. “That feels amazing,” you say at the sensation.

“Told you,” Heather says above you.

Then sliding off you, she runs her hand to the base of your cock and starts to roll the condom back up so that only the top half is covered by the rubber.

“This is more what it’s like without.”

Again, she places your cock against the entrance to her pussy. This time she lowers herself down onto you so that two-thirds of your hardon disappears into her. The feeling of tightness and heat is contrasted by wetness where your sister has slid the uncovered section of your cock inside her.

“Oh fuck!” you say as you throw your head back onto the bed, your hips rising up into Heather.

“Not too much,” she says as she presses her hands against your stomach to stop you from going all the way inside. Heather keeps the pair of you in that position as she rises off and then slides back down again three times slowly. Then jumping off you she lies down next to you, her chest across you.

Kissing you on the lips. “We want to keep you a virgin for your girlfriend,” she tells you as she pulls the condom off your cock. “I'll get rid of this while you go have a shower.”

Heather then disappears into her room leaving you to find a hiding place for the remaining condoms. You take a long hot shower, making sure to scrub your face and privates thoroughly. By the time you get out and head into the kitchen, your Mom is home and starting to get dinner ready.

“Are you hungry dear?” she asks when she sees you.

Heather calls out from the kitchen table listening in, “he’s eaten already, Mom.”

At least your sister is in a much better mood with you now than this morning.