https://www.dlsite.com/books/work/=/product_id/BJ246683.html
https://www.dlsite.com/books/work/=/product_id/BJ500922.html (English)
https://comics.inkr.com/title/1439
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Stealthily Fucking My Dozing Boss (She Came While Pretending to Sleep)

"If you're not awake, then I'm putting it in..." His throbbing, pulsating member slides deep inside of her...
During a late night at the office, Reiji Kirishima finishes his work and finds his boss, Mika Arimura, on a sofa, fast asleep. He attempts to shake her awake, but to his surprise, her breast falls out of her shirt!
Mika, who is normally crass and intimidating, turns out to be rather arousing, half-naked in her sleepy state!
When even touching her boobs doesn't wake her up, he starts to up the ante—but as it turns out, she was awake the whole time! Though she was merely pretending to sleep to let him off the hook, Reiji's hand finds its way inside her panties...
"If he keeps teasing me like this, I won't be able to keep my voice down...!" Mika desperately attemps to control herself, but her groin is soaked, and when she sees Reiji's swollen crotch, even she can't hold back...!!

Japanese RAW (Chapters 01-10): /g/1848438/bff09410d4/
English Webtoon version: https://comiko.net/series/126234/stealthily-fucking-my-dozing-boss-she-came-while-pretending-to-sleep

Page 38: Who takes their pants off when they sleep, but keeps their button-up shirt and tie on? This man is conducting a Zoom call in his dreams.

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