Give them privacy.

You take one long last look at the girls to commit every detail to memory. You wish you could get a better view of Trish’s naked body but it’s your sister in there with her. If you weren’t related you're sure you would have made yourself know and seen what happens. Leaving with the image of Trish and Heather mashing their wet pussy mounds against each other you head back to your room and beat your frustration out on yourself. Finishing what you started in the doorway by stroking yourself to orgasm thinking about sliding in between the pair of them and fucking Trish like your sister can’t.

When you get up the next day your mind immediately goes to the amazing sex you had with Amber at Dave’s party last night and then to your sister and her best friend fucking each other. Heading back to Heather room you know you aren’t going to catch them going at it again but open the door suddenly anyway.

“How was the concert?” you say to the pair of girls sleeping naked on top of Heather's bed where they passed out after fucking each other senseless.

You laugh evilly to yourself as Heather screams at being woken up so suddenly.

“Oh my God. You’re such a pervert!” Heather yells at you as she grabs the pillow behind her head and covers her breasts. She flicks one edge of the blanket she is lying on over herself to cover her exposed pussy. Both of which you have more than enough time to see in the bright daylight now.

Trish in comparison doesn’t move at all other than to jolt awake at you and Heather’s shouting. She is quite happy to lie there naked, giving you a carefree smile.

Comparing the two blondes, Heather is the taller and leaner of the two. Trish isn’t overweight or anything, she just has wider hips. Her tits are bigger too and hang with their weight, unlike your sisters which are perky and tight. Both girls you notice shave which you find particularly hot. You guess the razor Heather leaves in the shower isn’t just for her legs after all.

“I just wanted to know how the concert was,” you repeat as you and Trish keep your eyes locked on each other.

“Fuck off bro. Can’t you see we’re naked,” Heather continues to yell at you.

“I sure can,” you say with the bigger grin. One Trish matches as you swear, she opens her legs a little wider to give you a better look at her snatch.

“I’m calling Mom,” Heather threatens as you back your way back out closing the door behind you. Trish not covering up until your gone.

Well if you hadn’t pissed your sister off before, you sure have now. Any goodwill you had for selling her the ticket probably gone now. Totally worth it though.

You decide to grab a quick shower before they get up. Heather always takes forever in the bathroom you both share. Getting dressed you had into the kitchen where your Mom has left some pancakes out for you and Heather. You grab a short stack and smother it in maple syrup then head back to your room to grab your wallet and keys. Before you leave you pick up the scrap of paper Amber left you and head off to enjoy the first day of your weekend.