Book One- I Don't Understand

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Jack smirked and took off Sam's tank top, tossing it aside. He took off her jeans and boots, leaving her in her undergarments. Sam slid off Jack's jeans and shoes, leaving him in his boxers. He lifted Sam up and held her by her ass before walking backwards up the ladder, carrying her to his mattress. Gently tossing her onto the mattress, Jack went over her and bent down to meet her lips as he rubbed her thighs. Sam ran her fingers through Jack's hair, then running a hand down his back. His skin is so smooth, she thought.
Jack disconnected their lips and ran his lips down Sam's chest, kissing her V-line, making her buck her hips. Jack looked up at Sam for permission, which she nodded. He slid down her panties and took them off completely, putting it near a corner so she can get those afterwards. Sam bit her lip as she took off Jack's boxers, putting them beside hers. With Sam in her bra and Jack in nothing, he took out some lube and rubbed it all over his erection. Sam blushed a crimson once he tossed the bottle aside and held onto her hips, his touch soft and gentle. "Are you ready, baby girl?" Jack purred. Sam closed her eyes and nodded, biting her lip. Jack took in a deep breath and began to slide it in.
"S-Sam," he moaned, "y-you're so tight..!"
Sam threw her head back and began to pant. "Jack! It h-hurts.."
Jack smiled. "It's ok. It's because you're losing your virginity. It's gonna hurt but then it'll be pleasure."
She nodded, taking his word for it and gripped the sheets, her knuckles white. "J-Jack..!"
Jack hit the same spot again, making her hips buck. "Th-that's my s-spot," she cooed.
Jack kept hitting the same spot.
"F-Faster," Sam pleaded.
Jack nodded and thruster faster, making her go crazy. "J-Jack..! Jack!"
Jack felt his erection harder. "Babe.. I-I'm c-close.."
Sam began to pant, bucking her hips. "F-Faster J-Jackie!"
Jack nodded and went faster, moaning out Sam's name. "S-Sam..!"
Sam felt him hit that sweet spot, sending her into overdrive. She threw her head back and grunted. "J-Jack.. right th-there.."
Jack hit the spot again, making her scream his name. Jack felt himself reaching his climax and grunted. "S-Samantha.. I'm close to m-my climax.."
She nodded. "S-Same."
With one final moan, Jack pulled out and cummed all over Sam's chest, the white, warm sticky substance splattered over her. Her breathing was still fast and her forehead was covered in sweat. Sam's hair was all over her face and her knuckles were paper white. Jack panted and turned to Sam, his hair stuck to his forehead. "How was your first time?"
She turned, out of breath and said, "it was the best feeling I've ever felt." Jack scooped up Sam bridal style and went down the ladder to the bottom. They went into the wash room and stepped into the shower, Jack removing Sam's bra. They went inside and turned on the warm water. She had her hands over her nipples, making Jack giggle.
He moved her hands down and put them at her sides. "You're gorgeous. Don't be afraid to show me your skin, Sam."
Her cheeks flushed pink as he cleaned the rest of the cum off her chest. "Jack.. I.. I love you."
Jack smiled and kissed Sam, running his fingers through her wet hair. "I love you so, so much more."