Based on this old short story:

Part 1:

Part 2:

Part 3:

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...
This night for Mark was the same as many other nights he had in his early twenties. At some private party where there are almost only attractive young girls who are ready for fun, and a lot of alcohol, including vodka and whiskey that Mark would drink without interruption. His parents are still giving him all the money he needs to lead his life and enjoy every day of his youth and their status. But despite the wealth, at the morning Mark always woke up with a strong headache, and usually with some unknown girl sleeping next to him on the bed.
And this morning was supposed to be the same, but it didn't. Upon awakening, Mark noticed that the usual pain in his head from a hangover was absent and instead of that he felt an unusually strong euphoria and energy in his body. However, instead of the usual soft mattress on which he had slept, this time he had woken up on the hard wooden boards.
"Marina, you overslept" Mark heard someone yelling loudly.
"Shut your fucking..." he replied reflexively, and stopped when he realized that this is not his usual voice. Mark immediately opened his eyes and looked down at his body with wide-eyed disbelief and surprise. On his chest were two small, perfectly proportioned and white breasts with beautiful pink nipples at the end of them. "WHAT THE FUCK?!" was all he could say, looking at himself, unable to believe it, hearing his strong Russian accent.
"Marina! Damn, what's wrong with you? Wake up, bitch, this is serious!" the female voice called him angrily, while a naked young brunette girl trying to stand up and looking herself over quickly. It was obviously a female body, skinny and fragile, unlike the musculature that Mark was so proud of. Now his hands seemed too narrow and small, as did the rest of his body.
"Ugh. Uhhh... My... my..." he muttered feeling how long hair touched his face and how something tight pressed his feets not noticing that he wearing black leather long boots up to his knees.
"Seriously? Fuck, Marina, are you fucking kidding me?" the girl, after taking a deep breath, pushed the door and walked over to Mark who was kneeling and almost fell down. She looked over the confused young girl.