Family Ties/You want to fuck her boobs
Heather smiled and took off her shirt, showing her bra covered chest before that too was stripped away to reveal her incredible chest. Her nipples were already hard from pleasure.
She leaned down and took off your pants and underwear in one go, your dick jumping out at her.
"Just as big as I remember," Heather said and pushed her boobs together with her hands before planting your dick in between them. You gasp from the feeling of firm softness surrounding your cock, the feeling completely different from her pussy. She began thrusting up and down, picking up pace as you reached your limit.
"You like this Timmy? You like fucking your big sister's titties?" Heather asked with a grin and you nodded. "You get to have all of me to yourself during the trip so don't worry because there is so much more to come."
Just as she finished her sentence, you came and covered your sister's face and chest with your seed. Heather got up and cleaned herself with her shirt before throwing that into her dirty basket. You helped her with some of her packing and enjoyed watching her change into a skimpy bikini top and a pair of Jean shorts that showed off her curves. You didn't miss how she 'forgot' to wear anything under it and walked out to the RV.
"Okay does anyone have their things with them? I mean it when I say that I'm not turning back for anything," Your father asks and your family nods. "Alright then, let get this show on the road!"
Your father went into the front of the RV to start it up and your family piled into the living quarters. Jacob quickly went into the back bedroom to catch up on some more sleep while Jessica decided to join your father up front. You and Heather took a seat on the couch with her close to the window while your mother made her way into the makeshift kitchen.
"I'm going to get started on some snacks for the trip," Your mother said and left you and Heather alone on the couch. You grinned at Heather and slid closer to her, watching her turn to face you.
"Looks like we got some time alone," You stated and watched as Heather put one long smooth leg on the couch to part her legs better, a lustful look on her face. "How about we finished what we started back home?"
"Yes please" She moaned and you quickly moved to kiss her. Your tongues danced as the two of you moaned softly, keeping it quiet to avoid your family noticing. Your hands easily found their way to Heather's chest and pulled the bikini top away. Pinching and pulling them made Heather buck against you, rubbing her Jean shorts covered pussy against your dick that was staining against your pants.
Heather pulled away from your lips, panting. "Timmy we might get caught if we fuck here." Even though she said that, her tone showed that she clearly wanted to fuck anyways.
You struggle to decide the right course of action.