totally captivated
I agree with shin that it depends on what you're fond of but for me something that would be just as amazing as viewfinder would probably be either KATEKYO or UNDER GRAND HOTEL. While katekyo is cute and fluffy with the occasional possessive sadistic seme, under grand hotel is way more messed up than viewfinder and a twisted pairing too.
Haru Wo Daite Ita
Honto Yajuu
Is there a yaoi manga that can top up to you're my love prize on viewfinder? If there are is and you know it can please tell me about it