I read this a while ago and haven't finished, now I forgot the title,,,

it's about two highschool friends, both of them have brothers. one day when one of the boy visits the other one in his house, they see their big brothers having sex, and the one visiting is very shocked. the other one isn't really bothered by that because apparently they have been doing it at his house pretty often so he often saw them in action,,

anyone know what manga is this 😕 ?

Thanks in advance~ 😃

http://www.mangaupdates.com/series.html?id=56882

woooo!!! thank you so much Narsmaught~!! 😳