Capricious Love Cupid

ch1-2 -- Enomoto Kai's father runs a gay porn production company, and Kai hangs out there because at school people are making fun of him. One day he gets locked into the lounge to be kept out of the way of a shoot (him being a teen and all), and when he decides to watch TV, it turns out a porn video with his favourite two actors is in the VCR. In the middle of watching it with a certain fascination one of them walks in on Kai.

ch3 -- Since their father got remarried, Haru and Mizuki have a new brother, Yoshi. Mizuki is really excited because he's always wanted to be an older brother to somebody and do for them what Haru does for him, and while Yoshi is only 2 months younger, Mizuki is determined. But Yoshi doesn't seem to like him much, and him and Haru fight all the time too. When mizuki finally gets all depressed about that, they come up with an innovative way to all get along.