Fallust's Manga

Threesome where 2 are in love with each other and the third is too close a "friend" to one of the lovers to do anything (literally) without the other; they both fuck the same guy (who prefers the friend's cock in his ass over his lover's cock). For a while there it seemed like the friend was developing romantic feelings for the uke, and desired to mark him as his; this pretty much falls away though and doesn't go anywhere in the end. After everything, I still can't tell if the uke and the friend actually love each other or not, even though they're the ones on the cover rather than the uke and his lover.