Oji Kagi -Kyonyuu JK wa Otonari no Ojisan to Ecchi Shitai-

I have a secret that I can't tell my friends. Living next door is my neighbor, a boring older man. But that man's "scent"... It's a little oily, mixed in with the smell of an old person and tobacco. Every time I catch a whiff of that scent, I get aroused... One night, I helped my drunken neighbor back to his place, and it was filled with his scent; and then, just as I felt like I was about to go crazy, this drunk older man's hands reached out from behind me... (Source: DMM)