Gitei to Tsunagaru Karada, Kedamono no Koi.

Dumped by her boyfriend, and with her workplace bankrupt, Maiko Nishino's life is a series of misfortunes. To make things worse, an old friend sold her off as debt insurance, putting Maiko in dire straits! That's when her younger stepbrother, Touri, who she hasn't seen since she parted ways with him 15 years ago, steps in to save her. In that time, Touri has grown into a handsome young company president. In return for his help, Touri wants... Maiko's body!?

(Source: Renta!)