Mia had known for weeks that the house was too small for the way Sienna looked at Ryan.
Sienna was twenty-six, Marcus’s younger sister, in town for the summer after the lease on her apartment fell through. Lena was twenty-eight, Mia’s older sister, married to Marcus for three years and still sharp-mouthed about it. Mia was twenty-four. Ryan was twenty-five, broad through the shoulders, patient in bed in a way that made Mia greedy. They had been together fourteen months. He stayed over most weekends. Sienna had the guest room at the end of the hall. The walls were thin. Everybody heard everything, and after the first week nobody pretended they didn’t.
It started with the pool.
Marcus was out of town on a job site. Lena had opened a bottle of rosé at three in the afternoon and told the others to stop being boring. Sienna swam in a black bikini that tied at the hips. Mia watched Ryan watch the ties. Lena watched Mia watching him and smiled into her glass like she had already decided how the evening would go.
“You’re staring,” Lena said, not to Ryan. To Mia.
“So are you.”
“I’ve been staring at her since she was legal and annoying,” Lena said. Sienna flicked water at her. Lena didn’t flinch. “Doesn’t mean I don’t know what she looks like when she wants something.”
Sienna hauled herself out of the pool. Water ran down her stomach and into the waistband. She stood over Ryan’s chair, dripping on the concrete between his feet.
“Your girlfriend’s sister is mean,” she said.
“She’s not wrong, though,” Ryan said. His voice had gone lower. Mia felt it between her legs.
Sienna bent, slow, and kissed him. Not a peck. She fitted her mouth to his and stayed there until Mia made a sound she hadn’t meant to make. When Sienna pulled back, her lips were wet and she was looking at Mia.
“Your turn to say stop,” she said.
Mia didn’t say it. She set her glass down, crossed the patio, and kissed Sienna herself. Sienna tasted like chlorine and wine. Her bikini top was cold against Mia’s thin shirt. Ryan’s hand settled on the back of Mia’s thigh, high enough that his thumb brushed the edge of her shorts. Lena watched from the lounger, one knee bent, the other leg stretched, robe open over her swimsuit.
“Inside,” Lena said. “I’m not giving the neighbors a free show, and I’m not sitting this out.”
They didn’t make it past the kitchen.
Ryan lifted Mia onto the counter. Her shorts came off in one pull. Sienna stood between her knees and licked her while Ryan kissed her mouth and palmed her breasts through her shirt. Mia came fast, surprised by it, fingers tight in Sienna’s wet hair. Lena stepped in behind Sienna, untied the bikini bottoms, and slid two fingers into her from behind while Sienna was still licking. Sienna moaned into Mia’s cunt. The vibration made Mia jerk and come again, weaker, shaking.
Ryan freed his cock. Lena wrapped a hand around it, stroked once, and guided him into Sienna. Sienna’s mouth left Mia only long enough to gasp. Then she went back down, sloppy now, while Ryan fucked her standing up and Lena worked her clit from underneath. Mia held Sienna’s head and watched her boyfriend’s hips snap forward. Every thrust pushed Sienna’s tongue deeper.
“Don’t you dare finish in her yet,” Lena said. “Mia hasn’t had him.”
Ryan pulled out. His cock shone. Sienna turned, dropped to her knees beside the counter, and took him into her mouth to clean herself off him. Lena tugged Mia forward to the edge, lined Ryan up, and pushed him in. Mia was swollen and slick. He sank to the base and stayed there, breathing hard against her neck, while Sienna sucked his balls and Lena kissed Mia like she had been waiting years to do it in front of someone.
They moved to the guest bed because the counter edge was biting Mia’s thighs. Lena locked the door out of habit even though Marcus was two states away. Clothes came off the rest of the way. Sienna’s bikini top hit the floor. Lena’s robe followed. Ryan sat against the headboard and Mia climbed into his lap, sinking down on him with a long exhale. Sienna knelt behind her, kissing her shoulders, reaching around to rub her clit. Lena straddled Ryan’s face, facing Mia, and lowered herself onto his mouth.
Mia had never seen her sister like that. Lena’s head tipped back. Her breasts swayed. She ground down on Ryan’s tongue and kept her eyes on Mia the whole time, one hand braced on Mia’s collarbone.
“He eats you like this?” Lena asked.
“Every time I ask.”
“Good.” Lena’s voice broke. “Don’t stop asking.”
Sienna’s fingers slipped lower, tracing where Ryan stretched Mia open, then pressed in alongside him. Mia cried out. The stretch was bright and too much and exactly what she wanted. Sienna fucked her with one finger beside Ryan’s cock while her other hand stayed on Mia’s clit. Lena came first, thighs tight around Ryan’s head, a low rough sound Mia had never heard from her. Ryan groaned into her and his hips stuttered. Mia clenched around him and followed, shaking so hard Sienna had to hold her up.
Ryan lifted Lena off his mouth. His face was wet. He looked at Sienna.
“Your turn on him,” Mia said, still pulsing around his cock. “I want to watch you take him.”
She climbed off. Come and her own wetness slicked her thighs. Sienna swung a leg over Ryan and sank down in one motion, no hesitation. She rode him hard, palms on his chest, ass flexing. Lena lay back and pulled Mia between her legs.
“Finish what she started,” Lena said.
Mia licked her sister the way she had imagined exactly once, guilty, and then never let herself imagine again. Lena tasted like Ryan’s mouth and her own arousal. She was sensitive from coming and still pushed up into Mia’s tongue, one hand in Mia’s hair, the other reaching to pinch Sienna’s nipple. Sienna swore and rode faster. The bed knocked the wall. Ryan’s hands bruised Sienna’s hips. He told her he was close. She didn’t get off. She ground down and came around him, and he came inside her with a broken noise, hips lifted off the mattress.
They stayed locked together while the aftershocks ran through her. Mia lifted her head from between Lena’s thighs, mouth shiny, and watched Sienna’s stomach jump.
“Stay in her,” Lena said to Ryan. “Mia wants to see it leak out.”
Sienna laughed, breathless, and lifted slowly. Ryan’s cock slipped free, still thick, streaked white. A line of come followed it, sliding down over her cunt. Mia caught it with two fingers and pushed it back into Sienna, then brought those fingers to Lena’s mouth. Lena sucked them clean without looking away from Mia.
They dozed in a pile for twenty minutes. Ryan’s hand rested on Mia’s ass. Sienna’s head was on Lena’s stomach. The room smelled like sex and pool chlorine. When Mia woke, Lena was already kissing down her stomach.
Round two was slower and meaner.
Lena ate Mia until Mia was sobbing into the pillow, then rolled her onto her back and sat on her face while Ryan fucked Sienna on all fours beside them. Every time Sienna moaned, Lena ground down harder. Mia couldn’t see much except Lena’s body and the flex of Ryan’s arm where he held Sienna’s hip. She heard the wet slap of him driving into Sienna and the way Sienna said his name like she had already decided he wasn’t only Mia’s anymore.
Lena came on Mia’s tongue and climbed off, shaky. She grabbed Ryan by the hair and pulled him out of Sienna.
“Both of them,” she said. “Don’t pick.”
He knelt between the sisters. Sienna and Mia lay shoulder to shoulder, legs spread, cunts flushed and used. He pushed into Mia first, three deep strokes, then pulled out and pushed into Sienna, three more, alternating until both of them were grabbing at him and at each other. Sienna turned her head and kissed Mia, messy, while Ryan fucked whoever he was in. Lena stroked him whenever he pulled out to switch, keeping him on the edge. When he finally couldn’t switch anymore he buried himself in Mia and came again, less this time, pulsing while Sienna rubbed Mia’s clit through it.
After, Sienna cleaned him with her mouth until he hissed and pushed her off, too sensitive. Lena laughed and did it anyway, gentle, until he was half-hard again. She looked up at Mia.
“Guest room’s ours until Sunday,” she said. “Marcus doesn’t need the details. You two can sleep in here or in our bed. I don’t care which. I care that nobody pretends this was a one-time accident in the morning.”
Mia looked at Ryan. His hand was on Sienna’s lower back. He met Mia’s eyes and waited.
“Not an accident,” Mia said.
Sienna smiled against her shoulder. Outside, the pool filter kicked on. Inside, Lena reached for the light, killed it, and pulled the sheet over all four of them. Mia lay awake a little longer, Ryan on one side, her sister’s knee hooked over her calf, Sienna’s fingers still resting low on her stomach, and didn’t feel anything she needed to take back.
