Gochuumon wa Ecchi na Yuutousei

When Hiroto lustily orders a call boy, it turns out to be Rurikawa, a cool and beautiful honor student who attends the same university as him! Despite it being Rurikawa's first day on the job, Hiroto, who is hopelessly aroused, decides to service Rurikawa...even though he's the customer! Get ready for sucking, licking, pumping, and other creamy fun in this erotic comedy! (mangaplanet.com)