Responses
i think its this! - http://www.mangago.zone/read-manga/kimi_towa_gokai_kara_hajimarimashitaga/
Yess thank you so much I've been running through so many old lists and I couldn't find it so this helps a lot!
no problem!! glad i helped :)
The mc writes this love letter to the love interest's sister but the brother ends up with he note and basically puts the moves on the seme because he's had a crush on him for the longest. The front picture is primarily pink and blue tones, with the mc holding an envelope?