Dirty Finchel idea: Rachel being on top for the first time and loving the crap out of it.
"Finn...Finn...FINN..." Rachel mumbles underneath him, pushing at his chest lightly. Slowly his upper body rises and he looks at her questioningly.
"What?" He replies confused with a slight husky voice, raising an eyebrow while stopping his movements.
"I...I...want to try something." Suddenly Rachel's voice grows quietly, a puff of hot air leaving her mouth and hitting Finn in the face.
"Now? I'm kinda...you know." He motions down with his his eyes. Rachel's face flushed even more and she bit her lower lip, pushing even more at Finn until he's rolling over. She feels him slip out of her body, a groan on disapproval leaving him.
"Rachel I love you...but I was...so close." Finn grumbles and looks at her.
"Well I wasn't..." She instantly says, causing Finn's confidence to drop and almost vanish entirely.
"Thanks for telling me I suck." He says and turns to move, but Rachel stops him and climbs on top of him, straddling his waist.
"You don't suck baby, but I wanna try this. I love you inside of me, I just wanna know how it feels like this." Rachel bites her lower lip and reaches between them, grabbing a hold of his condom-clad erection, pumping it a few times and sliding down. A loud moan escapes her as she slides down as far as she could, squealing at the sudden fullness.
"This...is so good." She rasps out and leans on his chest, clutching his shoulders as she starts to move slowly. Finn looks up to her and grins when her entire face changes to pure bliss, her eyes fluttering and her lips parting slightly. His eyes slowly wander down as Rachel decides to pick up the pace, moving faster and harder on top of him. His hands land on her hips, helping her move. His eyes glued to her bouncing boobs, Finn has a hard time holding back. This is beyond fucking awesome.
"Oh God...Oh my God Finn...OH..." She squeaks when he lifts her up completely and let's her crash down again, repeating the movement several times, until Rachel shifts back and puts her hand on his thighs, moving faster and harder, her lower body clutching around his erection.
"Fuck...FUCK..." She screams out as Finn let a hand wander between them, rubbing her clit quickly. Her entire body starts to shake and she cries out as her orgasm washes through her. Finn smirks and rubs her even more, his face forming into an 'o' shape as he cums as well, feeling her feels clutching him harder ever before.
"Rachel...baby..." He rasps out and bows his body off the bed. Rachel feels him cum and she smiles, licking her lips as she slips off him, taking off the condom carefully and grabbing a new one.
"What are you doing?" Finn asks and she grins triumphantly at him.
"I wanna do that again...that was sooooooo good." She grins and leans down, taking his cock between her lips, sucking it in. He groans as he feels himself grow hard again. He fucking loves his girlfriend.