Ok. I remember a while ago someone had a sig or they posted a picture of a particular scene.

Seme lying down with the uke on top. I believe the seme had longish (shoulder lengthish?) wavy light hair tied back, like half up hand down?. Something like that. I remember being interested and reading the manga after. I don't really remember anything else. Other than the image not really being that explicit.

That's not much to go on.

Kawaisa Amatte Nanika ga Hyakubai

Was it the cover of a manga? Like fvvjy suggested? Or a scene in the middle of the manga?
Was the uke on top or the seme was on top of the uke? Because Kawaisa Amatte Nanika ga Hyakubai only fits if "the seme is on top of the uke".
Do you remember the art? Was it a bit bara? Really skinny characters? The average body?
When you say the uke on top, do you mean it's a sex scene? With the uke riding the seme?

Bingo. Thanks fvvjy