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They both know what they're going to do next. Dipper and Mabel slowly slide closer to each other, and Dipper starts by kissing Mabel. Mabel kisses back, and then they start making out in the bathtub. They begin to speed up the make out session, little by little. After a few minutes, they stop and look at eachother. They realize they need to take it to the bedroom. They wash eachother for another few minutes and let the bathtub drain. They get out, dry off, put their clothes back on, and walk together while holding hands to their bedroom. As soon as they get into the bedroom, they turn the lights off and lock the door.
Mabel and Dipper quickly take their clothes off, and get onto Dipper's bed. Mabel gets on first, and Dipper gets on next. Mabel gets on her knees, turns her face and lays on the pillow, and spreads her cheeks. Dipper quickly sticks his dick into Mabel's ass and humps her hard, very hard. Mabel moans, Dipper grunts, and they both are enjoying the experience. After about ten minutes of anal, Mabel and Dipper relax for half a minute and then Dipper gets on bottom. Mabel positions her tight pussy onto Dipper's dick and bounces up and down on Dipper while he grabs Mabel's big and squishy boobs. This goes on for five minutes, and then they relax again for half a minute.
Mabel gets on bottom again, with her back on the bed and her legs spread. Dipper lifts her legs up and puts them on his shoulders while he swiftly puts his dick into Mabel's pussy and starts humping again, and again, and again. After about five minutes of that, they both lay down on the bed and pant, exhausted from all of the sex. They decide to take it down a notch and go back to making out. Dipper and Mabel face eachother while they lay on the bed, and start making out. Dipper starts fingering Mabel, and Mabel starts stroking Dipper's cock while they make out. This pleases both of them very much.
They realize something after they finish making out: they haven't done any oral sex yet. They decide that Mabel will start with the oral sex. Dipper lays down, puts his knees up in a sit-up position, and spreads them so his legs aren't in the way of his dick. Mabel wraps her arms around Dipper's legs and starts sucking Dipper's cock. The way Mabel sucks dick makes Dipper feel amazingly good. He puts one hand on the back of Mabel's head and the other hand on the back of his head. Mabel slowly moves down from his dick to his ballsack, which she starts licking immensely. After switching back and forth between these two actions, Mabel decides it's Dipper's turn for oral sex. They quickly switch positions, with Dipper's arms around Mabel's legs. He starts licking Mabel's tight pussy and Mabel moans over and over. He then moves up to Mabel's tits and starts licking her tits. Mabel is highly turned on by this. Oh, the pleasure of oral sex they feel.
After a couple of minutes for relaxation, they start doing regular sex for a while to finish off the wonderful night they've had together. Ten minutes later, they decide that they're done with sex for the rest of the night. Dipper wraps her arm around Mabel and pulls her closer to him. Dipper whispers into her ear, "I love you Mabel, you made me feel amazing tonight. I hope we can do this again soon." Mabel whispers back, "I love you too Dipper, we should do this tomorrow night." Dipper responds with "Sounds good to me. Goodnight." They sleep together while naked until the morning.