Responses
This one? Sorry if it's the wrong manga, I just googled it and found this. xD
http://www.mangago.me/read-manga/junketsu_ningyo/
That's it thanks : D
So uke is Merman and he starts working in big company and boss (seme) will orders him to conclude a contract with another company but he do not have enough time so he will turn into merman and. ..well he'll manage to do his job. . Boss was surprised how he mad it on time and starts questioning. .. the mermen had one rule : the cant tell lye so he'll tell the Trust.... sorry for bad English