looking for bl manga

so there's this bl manga i've read and completely forgotten the title or the author. but it goes like this the uke and seme are close friends/ bestfriend types and then they become couple the uke wants to practice his bottom for the seme before they do the deed so he bought a dildo and brought it home and practice on his room while practicing and almost reaching the climax his mother knock on his room and he panick and push some button on the dildo which activate the dildo and he reach the climax

thats all i remember, please pleasee help me find this story ༎‿༎