Family Ties/Chat with both sisters.
Bigstudlooking: You two really do look cute together. Way more than cute. You two are gorgeous! And there's no question you're sisters!
You watch as Jessie whispers in Heather's ear. Their mic isn't on, but she doesn't know that.
Hottyheather: She thinks that you're just saying that to be nice.
Bigstudlooking: Trust me, I'm not just some nice guy. You two are hot! Totally! Any guy would trip over himself just to get the chance to talk with either of you!
Heather reads your message out to Jessie who blushes further. She looks down, playing with the bottom edge of her nightie while sitting in her sister's lap.
Heather asks her a question but Jessie doesn't respond. So Heather tickles her, forcing her to laugh and talk. You've seen your sisters roughhouse before but knowing what you know now somehow makes this so much hotter. Your dick stiffens a little more.
Hottyheather: She claims she believes you now but I think you should be more convincing!
Your foot taps the floor nervously. You need to give them what they really want to hear. What they both want to hear.
Bigstudlooking: If I were in your room right now I would push both of you onto that bed then hold you close for hours. You're both so beautiful there's no way you could keep me off of you. I couldn't possibly let the two of you pass me by. We would kiss passionately and explore each other fully. I would ravish you both until the sun comes up, satisfying both of you again and again until you're mine forever and both of my hands are permanently imprinted with the scent of your hair.
Proud of yourself, you crack your knuckles before pressing the Enter key. If only you could hand this in to Mrs. Wilson; she's always said you're a terrible writer, but you just need the right motivation!
By the time Heather's done reading your latest passage aloud she's running her fingers down her neck and fanning herself with the collar of her sleep shirt. Jessie is blushing all the way red now and twisting the bottom of her nightie so high that she's unintentionally flashing her colorful panties to the camera.
Hottyheather: Wow! That's fucking hot! We definitely believe you! But she wants to know what you look like.
"Fuck," you say aloud, then kick yourself for saying it so loud. Heather had never asked you about this before, which had been something you were worried about for a while but apparently she just likes showing her tits on camera.
You jump on the web, searching for the picture of that jock you found a few weeks back that you based your current persona on. It took a suspicious amount of time but you're hoping they don't mind.
Sending them the image file, you add:
Bigstudlooking: Sorry, I still need to fix my laptop. But here's a pic of me when I was in high school.
Hottyheather: That was you in high school!?!!?! Fuck, you must be huge now!
Bigstudlooking: In all the best places... ;)
Heather and Jessie look at each other, smiling. Jess is starting to sit a bit higher and is fiddling with her hair. Heather is absentmindedly thumbing her nipple through her shirt. It seems like you've completed the mental image they've built of you quite nicely.
Hottyheather: Since you have us both here, is there anything you'd like us to do for you? ;D
You jump up from your chair feeling victorious and incredibly horny, but quickly sit down to avoid getting caught. They're eating up everything you say? What should you possibly ask for?