My girlfriend is sexy in the lab

After 9 PM, the diligent student in the school lab finally left, but another student was still studying in the lab across the street. Since many parts of the lab were made of glass, we were hesitant to do anything bold, but she couldn't wait any longer. She reached into my pants, grabbed my penis, and slowly started stroking it.

I knew she wanted it; she was the type who aroused quickly.

I also reached under her skirt to rub her vulva, and just as I was about to slip my hand under her underwear, I felt something wet.

"Where are your underwear?"

"I took them off in the bathroom after dinner. I waited for those guys to leave. Damn, working so hard on a Friday night."

"So what if they left? That pervert across the street is still here. I always wait for him."

"Let's go to the sink in the corner. He can't see us."

"The corner again. I never even use this spot after I've cleaned it up. It's only comfortable when I'm pinning you down. It was more comfortable when I pinned you down on the grass last time. It's too cold now though."

"Forget it! Let's hurry up. Otherwise, if we go back late, Auntie will tell my mom, and we'll have to go back even earlier."

I pulled up a chair and sat down. Haiyi (my wife/girlfriend's name) immediately straddled me. Damn, she was already soaking wet. My hard penis slid in without even needing to be aligned.

As soon as she got on top, she started bobbing her hips up and down. Although Haiyi was very passionate and wet, we hadn't done this much, and my penis wasn't very thick, so her vagina was still tight. But I didn't really like this position, so my passion didn't come quickly, but she didn't care.

"Mmm...so good...brother's cock is making me feel so good...oh...good brother...fuck me harder...yes...harder...fuck this slutty sister to death..."

Actually, she's older than me, and I usually call her sister, but only at this time does she call me brother.

"Brother, you move down there too! When I thrust down, you thrust up like before, that's how you penetrate deeper—faster!!!!"

Actually, I don't like her always ordering me around; it makes me feel inferior, especially today. I cleaned the experimental table thoroughly, but I still couldn't use it. Only by pressing her down and thrusting hard can I feel good, as if that's how I show my strength and advantage. So I wasn't very passionate that day, but I still cooperated by thrusting in and out. I couldn't let her wait all night naked.

"Brother, you're so good... This time your cock... is even... even bigger... Ah... Ah... Tingting is so happy... Right there... Brother, fuck me there... Oh... Sister... I'm going to die... Ah..."

Actually, I was afraid she would cry like that. Although she tried to keep her voice down, she couldn't help herself when she was passionate, especially when she orgasmed and squirted, she would always scream "Ah!"

Suddenly, her "Ah!" came, and instantly her juices flowed out, covering my penis and thighs.

Before, at this time, I would lift her buttocks hard and press her against the sink, thrusting wildly, because the water made it easier to ejaculate.

But that day, for some reason, maybe I wasn't in a good mood, I didn't do that. Haiyi was also puzzled and started to regret it. She always regretted it afterward, regretting only thinking about her own pleasure. Today, seeing that I hadn't given her a good time and there was no passion at all, she was even more upset.

She always cleaned up the mess afterward. Before, she would use her panties to wipe my penis and the semen on my thighs, and my panties to wipe her vulva, then we'd both put them back on. She thought being wet felt good, and I didn't mind.

Today was different. Seeing that I was unhappy, she gently dried me with her own panties, then dried herself, but she was too embarrassed to put them back on because they were already soaking wet.

"Baby, brother, what's wrong?"

This was the first time she called me brother without my penis inside her, and she seemed to enjoy it, making me feel comfortable comforting her.

"Nothing, I just didn't have much passion today. Are you comfortable?"

Then she reached out and touched her vulva through her panties, which looked like they'd been washed. She pulled her panties aside and guided my hand to touch her vulva. I inserted two fingers and moved them in and out, indicating that I was done.

I used to enjoy having her clamp my fingers between her vagina and my penis. Today, without me asking, she instinctively clamped them together, so I sped up my thrusting, faster and deeper than ever before. Haiyi seemed a little excited, her hips swaying back and forth as if she were being penetrated by a penis.

Suddenly, a gush of vaginal fluid sprayed onto my hand; Haiyi had another orgasm, and she sprayed out quite a bit more fluid.

I played a prank, quickly pulling my finger out and shoving it into Haiyi's open mouth. She grabbed my hand abruptly, seemingly unhappy, because she had never given me oral sex before, let alone swallowed my semen or even her own vaginal fluid.

I realized I'd gone too far with the joke and was about to pull my finger out when Haiyi suddenly released her hand and closed her lips, beginning to gently lick them with her lips and tongue. This suddenly excited me.

I turned Haiyi around and placed her on a chair, her buttocks facing up, her hands and head on the ground, while her buttocks and lower body remained on the chair. I quickly spread her legs, and my hardened penis slid smoothly into Haiyi's wet vagina. I began thrusting forcefully, regardless of whether Haiyi was uncomfortable in the position.

For some reason, my penis was already very hard, and the position felt good to me, but the pleasure from thrusting wasn't intense. I guessed it was because I'd spent the afternoon cleaning the lab bench without using it.

With each thrust, Haiyi moaned, I couldn't tell if she was enjoying it or if the position was uncomfortable. However, I felt my penis slowly soften, and after a while, it slipped out of Haiyi's wet, slippery vagina. Haiyi's moans stopped, and she got up on her own, looking at me apologetically. She then used her soaking wet panties to dry my penis before putting them back on, even her vagina.

To break the awkward atmosphere, Haiyi deliberately glanced at her watch. "It's already 10:30. I have to go home now. Are you still going to walk me home?"

I was about to say "no," but seeing Haiyi's dejected and apologetic expression, and remembering it wasn't her fault, I agreed to walk her home. It

was only a short walk, and I took her home.

[The End]

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