I can't remember the title of it, it was just a oneshot manga, it starts off with a guy who saw another guy naked one night and getting aroused by it (and actually imagining the two of them doing it), the guy then runs for the naked guy saw him staring. If I remembered correctly, a few months have passed and they saw one another at a train and the guy (the naked one at the beginning) recognizes him (even though he had changed his hairstyle) and in a way begs to have sex with him...the guy then finally gives him what he wants (getting a bj) for there were only three of them at the train at the time, the third man (the other passenger) then wakes up seeing him giving a bj and they ran off outside where they continued to have sex, the manga then speeds up to when they meet up once again and saying something like "I can't wait anymore, can we do it right here (now?)"