Pink

"Yumiko moonlights as a call girl because her day job doesn't pay enough to feed her pet, Croc. Haru, an aspiring writer who has nothing to say, sleeps with a woman his mother's age not just for the money but to work on his 'powers of observation'. So when Yumi's step-mom turns out to be Haru's sugar-mommy, it is time for shenanigans. A little bit of drinking, a little bit of blackmail and a visit with Croc is enough to change lives and maybe add some color to a comfortable but bland life."--Publisher's website.