I pay a favor to my colleague with sex

The Friday, was in need of a free day, with great urgency! I didn’t know how to do it, that day, I really need someone to take care of my work. Then, I asked the favor to my colleague. He refused, but I was really desperate, so I offered him sex in exchange for favour. This has changed the situation and this this Friday worked for me. And now this Sunday I had to pay for the favor. I went to his house and we locked ourselves in his room. The good news is that my colleague did not want much, just a simple getting fucked doggy style. He wanted to be his bitch for the rest of the afternoon. Nothing has ever done before.