Kasumi is training to be a singer and guitarist. One day she asks if you'd be willing to watch her practice after school. You pretend to be reluctant but you feel a surge of excitement in the pit of your stomach. You've always loved Kasumi, but you've never gone further than a kiss on the cheek. This could be a good opportunity for you to go further.
(Time-skip to after school)
You felt goosebumps as you press the doorbell. Kasumi answers the door and welcomes you in. She seems overly excited and happy to see you and grateful that you could help out.
As usual, she's made an effort to look nice. Her brown hair is nicely styled and she has just enough makeup to enhance her natural good looks. Today she is wearing a short yellow summer dress with a plunging neckline and no outward signs of a bra underneath. It shows off her slim but curvy figure.
She leads you into her bedroom. Walking behind her, you notice that her legs look amazing today and you catch the sweet scent of her perfume. You had a feeling that today was going to be special.
You notice there is a massage table in the room.
"It was a gift for my sister." She explained. Kasumi bends forward to adjust some towels over it. In doing so, she unwittingly gives you a nice view of her dangling breasts.
"Go ahead, try it," She said.
As you lie there, you start wondering what she looks like naked. Occasionally her hip or butt presses against your hand as she was setting up the guitar right next to you. You instantly had a raging erection.
You desperately try to hide it. If you had hoped that she wouldn't notice your erection, then you were deluding yourself. Your cock is barely contained in your underpants, the long thick shaft aiming directly at your navel.
Kasumi gasp and looks away. You both struggle to think of how to deal with the sudden elephant in the room.
Her hands are on your thighs, motionless.
"Uhhhhhhh…" she says.
You look around the room and start to whistle nonchalantly in an attempt to divert attention from your massive cock. For some reason, this doesn't work.
"Does that always happen when you see a pretty girl?" asks Kasumi eventually, with a coy smile on her face.
"Um, no, not usually," you reply.
"Is it just me, then?" she asks, looking you straight in the eye. One of her hands slides further up your thigh.
You don't reply, but your dick twitches visibly and draws her attention. She stares at it, biting her lip.
"It's big" she whispers, almost to herself. The hand on your thigh slides further up, the other she places on your chest. You hold your breath trying to not surprise her with any sudden movements.
Kasumi traces a finger-tip over the front of your pants, down to your balls, then gently up along the underside of your shaft. Your cock grows bigger and the head starts to poke her Kasumi's finger runs up and down a few more, then she grasped your cock through your pants and squeezes it firmly.
You couldn't hold back the pleasure, you groan and buck your hips involuntarily. This startles her and she draws back, aware that she has crossed a line.
"Don't stop," you said, taking her hand and placing it back on the massive bulge.
"We shouldn't be doing this," she mutters but doesn't take her hand away.
You place your hand over hers, guiding her in a stroking motion. Your pants roll down, leaving half your dick exposed. Kasumi's palm brushes your knob and gets smeared with a glistening trail of pre-cum. She slides her hand inside your underwear and caresses your balls.
"I've been waiting for this moment," she says, and pulls your underpants down your legs, discarding them on the floor. Then she squeezes some lube on her palm, grabs your cock again, and starts jerking it in earnest.
As Kasumi continues to stroke your cock, you reach over and place your hand on the back of her thighs, then slide it up under her dress. She tenses up and stops wanking you, but doesn't move away.
You give her a gentle squeeze at the top of her thigh, right below her ass, and then slide your hand between her legs, the length of your forefinger pressing against her panty-covered slit. She sighs and relaxes, parting her legs and moving her hips toward you for better access.
You slide your hand back and forth, rubbing her warm, slightly sweaty crotch through her panties, pressing the smooth material between her pussy lips. Then, with one fingertip just inside the edge of her panties, you trace your way up over the curve of her buttock. You grab her soft round butt cheek and squeeze it.
Kasumi sighs and leans forward further, cradling your cock against her chest. She reaches around and pulls her dress up obligingly, revealing her sexy ass to you in all its glory.
You run your hand from cheek to cheek, spanking her ass over her silky white panties.
"Owww! I'm…not…into…this!" spits Kasumi through gritted teeth as you punish her rear.
You stop spanking Kasumi and gently stroke her ass to calm her down.
"That's better," she sighs, starting to get up. "I don't like…"
You cut her sentence short by pushing her back down facing you and slamming your cock right up her tight pink pussy.
She looks so beautiful with her eyes and mouth wide open in pleasant surprise, getting pushed forward and back with her tits bouncing harder than a bouncy castle. Her quivering cunt is warm and wet around your rock-hard shaft.
"God, I fucking love you" she groans when she catches her breath. "Fuck me! Keep fucking me!"
You hadn't planned on stopping. You reach forward and stick your fingers in her mouth. She sucks on them greedily until you withdraw them with a pop. Then you reach around between her legs and start rubbing her clitoris, using her spit as a lubricant. You pick up the pace, giving Kasumi the missionary she deserves while she moans and pants uncontrollably.
Kasumi's pussy starts clenching as her orgasm hits, and this sets you off too. "In or out?" you gasp quickly, ever the gentleman.
"Out!" replies Kasumi.
Too late! The first spurt of cum goes deep in your girlfriend's cunt before you can withdraw. The rest splatters over her ass and pussy lips while you jack your cock furiously. You then wipe your cock clean between her ass cheeks.
"Fuck Kasumi, that was incredible!" you say, pulling her panties back up her legs and over her gooey buttocks. She stands up on wobbly legs, her summer dress falling back down to conceal her sperm-filled underwear.
"Next time I'm calling the shots," she says, giving you a passionate kiss. "Now get dressed. Your cum is dripping on my carpet."