Nande Neteru Ore no Chinko Nameta no?

Daiya is a university student who wishes to have a girlfriend. He spends his days studying and playing around. He usually goes to Oohashi's apartment after a long night out. Living alone, he doesn't have to worry about anything, and his location is also convenient. Moreover, Oohashi is always willing to take care of Daiya! One night, however, a shocking incident occurs... This warm and fuzzy feeling between his legs—it was Oohashi's mouth, sucking on Daiya's private parts?!

(Source: Fusion Product, translated)