Kaa-chan no Tomodachi ni Shikotteru Tokoro Mirareta.

For the longest time, Naoki has been nursing an unrequited crush on Shiori, his mother's best friend! How could he not have fallen for her? A beautiful woman comes to the house every night, taking care of him like a mother would as he grew up, but now that he is an adult, he sees her in a completely new *sexy* light. The mature aura of an older woman and the slight air of vulnerability as Shiori drinks and chats with his mom in their living room is simply irresistible. One night, the three of them are talking and sharing a meal when Naoki's mother announces she has to leave on a work trip. But she asks Shiori to 'babysit' Naoki while she’s away! He's an adult, dammit! He doesn't need someone to check on him like he’s some kid; he’s the one who looks after his mother most of the time, anyway! (Also, it would totally get in the way of his plans to crank out load after load to the hottest new AV actress who reminds him of Shiori in his brand new Fleshlight!!) As Shiori and Naoki bid farewell to his mother, Naoki can't help but get excited. He already had his *alone time* planned out, but now Shiori has invited him over for dinner and even calls him... Handsome! Maybe it's *not* a tale of unrequited love...?