Help me please

im looking for a yaoi or shounen ai (I forgot which) that had the uke whose mother was a mangaka and her assistants (that were girls) lived with her and they get a new male assistant who is the seme and the mother has rhe seme get on top of the uke so she could draw the pose. later on the uke and seme go to a fair and he learns that the seme was part of the yakuza. im sorry that's all I can remember I hope this was enough info -3-'