Saitei na Otoko no Ude no Naka

I can't have pure love… Everything starts when a timid young man falls in love with his helpless neighbour. Yuuto, a college student who has given up on everything, lives alone. One night, a neighbour and a playboy college senior, Sora, forcibly invited himself over for drinks and Yuuto accidently confessed that he is gay. Yuuto thought he would be disliked, but Sora approached him enthusiastically. Although Yuuto is surprised, he didn’t refuse Sora’s embrace and gentle touch.
(Source: Tokuma Shoten, translated)
Note: Includes 1 extra chapter.