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This was really testing your limits.
You struggled to stay both stationary and silent as Zhongli turned another page in his book. You had long since stopped paying attention to what was written there, mind slightly hazy as your focus narrowed in on you ever-growing need—and his. Zhongli moved one hand to your hip, and you belatedly realized that you had started squirming again.
“Be patient,” he said. “I’m almost done.”
“‘M trying,” you mumbled out, afraid that if you were any louder your voice would give away your desperation, something you were trying to keep hidden from him. Zhongli was always so put together, while you could barely handle a bit of teasing… it was embarrassing, to say the least. You didn’t want him to think you were so feeble when it came to intimacy. You unwittingly began to tremble.
“I can feel you shaking,” he said, voice low. “Breathe for me.” You could only whine softly in response, trying to steady your breathing. Fortunately, Zhongli recognized that you were reaching your limit and bookmarked the page he was on, placing the tome down to attend to you.
You were unsure of how to react as he lifted you off of his cock, carrying you bridal style from his desk to his bed. Zhongli was rather vanilla most of the time, and you weren’t sure what had sparked this. All you knew was that you had wished him a happy birthday, asked him what he wanted as a gift, and he had requested a day with you. Not out of the ordinary for him, but rather than taking you on a date, he had done this. Either way, you were relieved it was over.
Your body was hypersensitive, and his touch was nearly overwhelming. Zhongli was gentle as he lifted your hips for better access to you, and even more so when he pushed back in. You whined again as he bottomed out, unsure of whether you needed a break or not. Zhongli waited until your trembling had ceased, and then began to move, starting off slow. This was how he usually fucked you—a slow build up until you came in unison. This time, however, you doubted either of you would last that long, not after everything that had already happened.
Sure enough, you both came relatively quickly, though you climaxed first. Hardly surprising, really, with Zhongli’s uncanny stamina. Some days you wondered whether he was really human. Zhongli, though you could tell he was beginning to flag, was quick to begin aftercare. Eventually, you both once more ended up in bed together, though this time you were simply intertwined, embracing each other with no desire for more.
“Happy birthday,” you murmured once more. Zhongli laughed softly.
“Birthdays mean nothing. Spending time with you is far more meaningful.”