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A younger coworker is mean and single-minded - We were having sex right up until the first day of work...

"I can't start work at this rate, so please let me pull it out of you, Tsubaki-chan."
--Tsubaki, a hard-working SE, is always competing with his cocky younger colleague, Kirisaki.
Then, he has to stay overnight in the office with Kirisaki to deal with an emergency!
In order to effectively nap, she ends up sleeping in the only bed with the two of them, but she accidentally puts her chest against Kirisaki.
Her defenselessness was pointed out to her, and when she retorted, "Kirisaki-kun, you don't play around while you're working," and suddenly he hugged her tightly...
He then hugged me tightly and said, "Now, before work starts, you can do whatever you want to me, right?
He was making love to my sensitive spot so insistently that I couldn't stop the pleasure even though I wanted to resist.......