I have read it too, but also forgot the name.
You can try searching the porn star tag.
Right after I read your comment, I tried to find it and YEAH! I FOUND IT! Thank you http://www.mangago.me/read-manga/dream_land_yoshida_yuuko/
I found it http://www.mangago.me/read-manga/dream_land_yoshida_yuuko/ (づ￣ ³￣)づ
Yayyy XD
I read this manga about 2 mos ago and the story is about a guy (uke) with black short hair who has broken up with his girlfriend and he doesn't have any money left. Then he found an office job (?) but during the interview there's something unexpected happened, the boss (seme) a blonde guy thought that the uke is applying as a pornstar. The uke is in total shock but her remembered that he has no money, he just went into the flow.
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I know that the manga is still updating, but if anyone there know the title please tell me~ I really forgot the title of the manga （/TДT)/