Tsugou no Ii Jirai-kei Kanojo to Karada Dake no Kankei wo

Lyon is a beautiful landmine-type girl I met on a net game, who was playing in her underwear, even though we had never met before.
From then on, whenever I wanted to play games, go out, or just have a late-night ramen craving, I could call on her to hang out with me.
But neither of us knows each other's real name. We are not even really friends. I am comfortable with such a convenient relationship.
Because besides Lyon, I have a cousin and a junior colleague who are also landmine-girls.

"Oh, if you were actually my brother, then I could safely pamper you without getting the wrong idea."

"I can be another girl for you. I don't care if I'm second or third in line."

They want to have a convenient relationship with me, too...

(Source: Fantasia Bunko, translated)