I think the image had two guys in a bed on it.

Anyway, two best friends grew up neighbors. One of them sneaks into the other's room to sleep several nights through the window. The one whose room it is happens to be in love with the one sneaking in; however, he sees his friend with a girlfriend and gets aroused, etc.

However, at one point, the one whose room it is kisses the other while he is sleeping, but the mom sees and cries, so the one in love tries to distance himself from the friend and goes out on dates, getting a girlfriend as he doesn't want his mom to cry / hate him.

In the end, the two friends end up together.

But I can't find this story anywhere! Please help!!

Story sounds like a mix of Fuyushirazu no Koi and Gimmick but mostly the first one 🙂

You beautiful, beautiful human. Definitely mixing up these two stories which caused me to not find either! Thank you!!!