Yoru wa Tomodachi

Tobita has a cute face, but he's a quiet, expressionless and mysterious boy. He's also gay and extreme masochist. Masami finds out about it and he decides to get into the relationship with Tobita, taking the 'sadist' role. After their 'play' is over, they return to being just two people. However, Masami wants something more. Note: An extra chapter is included