Uhm idk anymore

Ok so my friend read this manga and I wanted to read it but she didn't know the name- So there is like this delivery dude and he comes into a house with these big-titied dude and they have sex but than some other guy is like "hey that's my man!" But than he gets fucked in the ass and they have a threesome and than they want him to deliver something again to have more sex. Idk if this is the actual plot since it was all in Japanese. Also she read it on a nokia phone so she didn't even really see anything but idc. It was on yaoimangaonline because that's a thing.