Yaoi that the uke gives the seme a hot blowjob? thanks >•>

http://www.mangago.zone/read-manga/you_re_my_loveprize_in_viewfinder/

the only manga that came into my mind

Right, viewfinder

If you don't mind it being a doujinshi, this is the hottest, nastiest and awesome blowjob i've ever seen in a manga !
* http://myreadingmanga.info/fizzcode-satonishi-ao-exorcist-dj-nii-san-ga-peropero-eng/

Viewfinder too..

http://www.mangago.zone/read-manga/sweet_inomoto_rikako/an/sweet-inomoto-rikako--chapter-5.html

Kuroneko Kareshi no Asobikata ლ(´ڡ`ლ)

Ai no kusabi, viewfinder aaaaand that's all I I can think of....wait.....there's 1 more I can think of ....boku no picu.....if u dare! (=・ω・=)