It wasn’t like you didn’t know that Sara had a thing for your sister, she’d always been happy spend time with Dawn if you were not there when she dropped by for a visit. Dawn too seemed to enjoy your girlfriends company, always laughing at her jokes and when she thought no one was looking casting longing glances at her back.
But knowing about an attraction was one thing, coming home early from work and hearing your girlfriend giggling and moaning from your sister’s room was another. You snuck up to the dawn and peaked through the crack, they were on Dawn’s bed, each in bra and panties, their hands caressing one another’s sides as their lips parted and another light giggle escaped your girlfriend.
“Stop it.” Dawn pouted and tried to silence Sara with another kiss.
“I can’t help it.” Sara giggled and put her arms around Dawn, pulling her into a more than friendly hug. “You’re just such a delicate little thing, you’re like Will’s polar opposite.” She giggled.
“Yeah well…” Dawn blushed as she accepted the hug and instead just undid Sara’s bra. “He’s a honk, with those abs and that ass, anyone would look delicate next to him.” She smiled as Sara let her pull out of the hug and she took Sara’s bra with her.
“You spend a lot of time looking at his abs?” Sara asked as she let Dawn run her fingers over her naked breasts.
“Every time I can catch him showering, or whenever we go swimming.” Dawn blushed as Sara reached around her and undid her bra as well.
“I bet he looks at you too.” Sara smiled and Dawn turned a deeper shade of crimson. “His cute little sister, all grown up with tits for days.” She joked and grabbed Dawns fairly small breasts.
“No, he’s seen yours.” Dawn sighed and placed her head against Sara’s far larger bust. “He’d never be impressed with mine.”
You push the door open and step inside in one smooth motion. “I think he would.” You say with a smile as both the women in front of you jolt away from one another.
“Will this isn’t what you-” Sara starts.
“I was just-” Dawn interrupts, but before either of them can finish you take 3 long steps over to them and sit down on the bed between them and they both go silent.
“I heard you talking, and I saw you.” You state calmly. “I’m not gonna buy any excuses.”
“I-I’m so sorry.” Dawn whimpers, tears gathering in the corners of her eyes as she reaches for a blanket to cover herself.
“Don’t be.” You note as you reach over and pull Dawn close, the blanket slipping out of reach. “You’re a woman, you have needs and feelings and you shouldn’t be ashamed of them.” You smile as you pull her in close, feeling her small firm breasts against you. “But you-” You turn your eyes to Sara and she scoots closer.
“I know what I did was wrong and I’m not gonna make excuses for it, but she’s been longing for so long and I just wanted to help her.” Sara pleaded. You reach over for her hand and she takes yours, letting you pull her into your embrace as well.
“You should have told me, relationships are built on trust. Did you really think I would say no if you told me you wanted to help my little sis?” Sara shakes her head meekly and you give her a small kiss. “I love both of you, anything that makes both of you happy makes me happy.” You smile as you give both of them a little squeeze. “I’m just sad you didn’t feel like you could share your troubles with me.”
“Maybe-” Dawn begins to speak up in a quiet voice. “We can make it up to you.” She suggests, looking up at you with the same puppy dog eyes she always used to wrap you around her little finger.
“You don’t need to make it up to me.” You smile and give her a small kiss on the forehead. “Just share with me next time.”
“But we want to make it up to you.” Dawn insists as she shifts her weight and you feel something warm and soft push against your pants, or more accurately, the growing bulge in your pants. You instinctively look down and sees Dawn’s thigh pushing against your growing bulge and your attention makes both Sara and Dawn look down at the developing situation as well.
“We do.” Sara says with a mischievous grin that you know all too well. “You’ve had a long day, so maybe we can just help you relax.” She says as she takes Dawn’s hand and places it on the bulge in your pants. “Just a bit of family bonding.” She smiles as Dawn catches on and begins to stroke the bulge through the pants.
You sit in stunned silence for a moment before Sara leans in and kisses you, pressing her breasts against your chest. The warmth of her lip breaks you out of your stupor and you kiss her back instinctively. You’re hands finds her tits and you begin to massage them as you kiss, below that Dawn looks up at you. Her eyes are shining with wonder as she watches you make out with your girlfriend and Dawn undoes your sipper without looking away from how your hands massage Sara’s breasts. She only looks away when she begins to pull down your pants and underwear, letting your cock spring free.
She stares at it transfixed as she licks her lips, leaning down for a closer look she wraps one hand around it and begins to stroke it slowly. Her fingers are thin and delicate things and her technique gentle but clumsy, a far cry from your girlfriend’s confident hard hand jobs. The tenderness and care she took with your cock made up for her shortcomings in technique though, and as your cock grew rock hard you felt her lips kissing the side of your cock. You’re cock gave a throb of pleasure and Dawn kept going, not so much sucking your cock as simply kissing it, constantly searching for new angles to kiss from.
As she kissed the tip of your cockhead you’re hips gave a small involuntary thrust upwards and your cockhead slipped in between her lips. Her eyes went wide as she froze in place, your cockhead between her lips, slowly she built up the courage to let her tongue go exploring and she let it slowly lick across the tip of your cock. It swept up the first drop of precum and her body shuttered with exhilaration from the taste. Dawn let her tongue circle around your cockhead but kept her lips where they were. You let a hand leave Sara’s tits and put it on Dawn’s head instead, you caressed her a little before slowly applying just enough pressure for Dawn to realize what you wanted.
She slowly lowered herself deeper over your cock and you turned your attention to Sara. She seemed content with playing second fiddle to your sister but you wouldn’t have it, you reached down with your free hand and pushed her panties aside to get to her sex. She was already wet, though you weren’t sure how much of that had been from her and Dawn’s make-out session. You slid two fingers inside and began to slowly fingerfuck her, drawing a moan from her into your kiss, you couldn’t help but start moaning as well since Dawn was getting the hang of cocksucking and was treating your cock like the most luxurious lollipop to ever be created. You let her keep sucking as you opened Sara up a bit more with every thrust of your fingers.
Dawn’s sucking eventually slowed down and she sat up straight, her fingers still stroking your cock as she worked the kinks out of her neck.
“Come over here Dawn.” Sara smiled as she pulled out of your kiss and positioned herself over your cock, your fingers slipping out of her. “How about you guide it in?” She smiled. Dawn lit up and scooted in closer, steering your cock as Sara slowly lowered herself onto it. It slipped in with a wet noise and a moan from Sara as Dawn watched in fascination as Sara began to ride you.
“Come here sis.” You say, trying and failing to not make it sound like a demand. Obediently Dawn crawls around Sara, watching your cock vanish into her pussy again and again before she manages to tear her eyes away to look at you. You grab her delicate chin and pull it close, giving her a loving kiss that makes her go weak against your body. You help her up onto her knees properly so you can get your lips on her breasts and you give them a big kiss. “To think you don’t think your breasts are amazing.” You moan, Sara’s riding speed increasing. “They’re perfect just the way they are.” You assure her as you begin to suck on her nipple.
Dawn lets out a moan of pleasure as your hand finds her panties, they’re drenched already and you push your finger against them, feeling them slide in between her lips with only the thin cotton barrier between her sex and your fingers. She slides back and forth on your fingers as you bite down gently on her nipples, a passionate moan escaping her lips as your thumb finds her clit through the panties and begins to stroke it through the fabric. She whimpers and closes her eyes as you work her pussy and clit through her underwear, you can feel she is close but its not quite enough to tip her own. You lower her a little with your free hand and looks deep into her eyes. “I love you sis.” You say as you lean in and lock lips with her.
Dawn’s body spasms and even through the underwear you can feel her pussy trying to pull your fingers in, she whimpers into your kiss, her body so caught up in the whirlwind of her pleasure that it overwhelms her. On your cock Sara sees Dawn climax and reached out, stroking her back. She picks up the pace and rides you hard. “My turn.” She whispers seductively and you begin to thrust up into her.
“Thanks for waiting.” You moan as you thrust in deep, keeping your sister snuggled against your chest as you fuck your girlfriend.
“Told you-” She moans and drives the cock deep inside of herself with her full weight. “-I wanted to-” She’s gasping now and you feel your own control slipping as well. “-Help her!” The last word ends in a scream as Sara plunges herself onto your dick one last time and climaxes. Her pussy contracts around your cock like a vise and your cock erupts inside of her. Lying against your chest Dawn can feel your body quiver as you cum and her hand reaches down to her own sex, caressing it gently through the wet panties as she watches you pump your girlfriend full of your seed. Sara rides you for a while longer, milking every drop out of you before she lets you have your rest and slips off of your cock.
You reach out with your free arm and she joins you and Dawn on the bed. Dawn is still touching herself softly as Sara leans across your chest and gives your sister a loving kiss. Dawn answers back in kind and you just massage each of their backs as your girlfriend and sister kiss across your chest.
“So…” Sara says as she pulls away from the kiss eventually and flashes you her mischievous smile again. “Did we make it up to you?”
You let your hands trace down their backs until you have both of their asses in hand, slipping a finger between their legs to stroke against their wet panties and filled lips respectively. “You more than made up for it.” You give both your sister and your girlfriend a deep loving kiss. “Just make sure to include me from the start next time.”
Source: reddit.com/r/sexystories/comments/c0cs03/what_to_do_when_your_girlfriend_is_making_out
Great writing and story overall