My sister was out cold, so I (22F) gave her boyfriend what he needed [MF]

I walked into my apartment, feeling sweaty from pilates class and totally ready for a shower. I dropped my bag near the door and saw Matt, my sister Ashley's boyfriend, lounging on the couch playing some video game.

"Hey Matt" I called, smiling.

He glanced up and paused the game real quick. "Oh, hey! How was class?"

"Brutal, but good." I laughed, heading straight to the fridge. "Want a beer?"

"Yeah, sure, thanks" he said, already back into his game.

I grabbed two beers and sat next to Matt, handing one over and taking a sip from mine. Sitting close, I wondered how I could mess with him a little before I head to the shower.

"So" I nudged him lightly. "where's Ashley?"

"Totally knocked out" Matt said, eyes glued to the screen. "She had that wisdom teeth surgery, took two sleeping pills, and now she's completely out. I'm here just to keep an eye on her."

"Awww" I teased, putting my hand on his thigh. "You're literally the sweetest boyfriend ever."

He blushed a bit, smiling shyly.

I leaned closer, and asked. "Guess her mouth will be off duty for blowjobs now, huh?"

Matt's eyes widened in surprise, and he laughed nervously, glancing quickly at me. "Yeah, and it's also her time of month, so it's been kinda rough on me."

I bit my lip playfully. "Aw, poor you" I teased gently. "Is it true guys feel heavier down there when they haven't cum in a while? Like their balls are heavier and bigger?" Without waiting for an answer, I reached between his legs, gently cupping his balls through his shorts to find that I was right. He jolted slightly, gripping his controller tighter.

"Whoa, wait. what are you doing?" he stammered nervously, glancing toward Ashley's room, but clearly enjoying my touch.

"Relax" I whispered, rubbing him gently. "This isn't cheating. Think of it as a thank you for being so sweet to Ash."

He hesitated, breathing heavier as my fingers teased along his hardening cock. "Ashley's out for the rest of the night at least" he admitted quietly. I smiled reassuringly, slipping my hand inside his shorts and wrapping my fingers around his warm, thick cock.

"Fuck" Matt murmured quietly, holding his controller tightly.

"Keep playing." I said softly. "Just enjoy it and pretend I'm not even here."

I slid down onto my knees in front of him, tugging his shorts down a bit and freeing his cock. He groaned softly as I leaned forward, licking lightly around the swollen tip. His skin felt hot against my tongue, and the musky scent of his arousal filled my senses, making my heart pound harder.

"Careful" he whispered, tense. "I haven't cum in like a week... it's probably gonna be a huge load."

"Good" I said, looking up at him playfully. "I'm kinda hungry."

I wrapped my lips around his cock, slowly sliding him into my warm, wet mouth, feeling it fill my mouth perfectly. I teased him slowly, moving my tongue around his sensitive head, enjoying the taste of his salty pre-cum. My lips wrapped tight around his shaft, gently sucking as my mouth moved up and down slowly, savoring every inch of him. My tongue traced lazy circles around his cockhead, and my fingers lightly stroked and massaged his balls, feeling their heaviness.

Matt kept playing his game, sipping beer occasionally, but his focus was clearly slipping, soft moans escaping his lips as pleasure took over him.

After about 20 minutes, my mouth was getting tired, and I knew he needed to cum. I sped up, bobbing my head faster, taking him deeper until his cock brushed against the back of my throat. The room filled with messy, wet sounds as saliva dripped down his shaft, my hand sliding smoothly along his length in rhythm with my mouth.

"Oh god" Matt whispered, hips twitching as I quickened my pace even more. I squeezed his balls gently, feeling how tight they were, knowing he was close.

Matt's breathing became rapid, his grip on the controller tightening. I sucked harder, swirling my tongue rapidly over the tip, feeling him swell and twitch urgently.

"Fuck, I'm gonna cum" he groaned desperately.

I sucked deeper, keeping my mouth tightly sealed around him as he exploded. His hot cum burst powerfully, hitting the back of my throat, filling my mouth quickly. It was so much that some spilled out, running down my chin and dripping onto his thighs as he kept twitching and moaning.

I swallowed as much as I could, savoring every bit before slowly pulling away and licking my lips clean. Gently, I zipped up his shorts, then climbed onto his lap, straddling him. Leaning in, I nibbled his earlobe lightly and whispered softly, "If Ashley stays asleep and you want more later, my door's unlocked. Come use me however you like."

I slid off his lap, leaving him flushed and breathless, and walked back to my room, heart racing, hoping Matt would come visit me soon.