Anyone know what the name of this BL manga is?

There was this manga I read a while ago but the name is escaping me. It's about a kohei and a senpai. I believe one of the characters name was Michiru or Sakurai. They play basketball at their school. When they had sex for the first time, the seme got a nosebleed. When they finished their sex session, the send cried and got sad saying he was sorry he couldn't do it better but the uke reassured him saying he likes him even more now. It end with the sister walking into the bedroom angrily saying something about her boyfriend. I'm not sure if this was a complete manga or a oneshot but I'd like to know what the name was and check it out again. Thank you for taking the time to answer this my fellow yaoi lovers.