a yaoi where the seme was/is straight and the uke is gay and likes the seme

http://www.mangago.me/read-manga/doushitemo_furetakunai/. One of the best straight seme/gay Uke stories ever!

http://www.mangago.me/read-manga/konbini_kun/
http://www.mangago.me/read-manga/wonderful_days/
http://www.mangago.me/read-manga/lotus_eater/
Are just a few. Check the straight seme tag.

http://www.mangago.me/read-manga/soredemo_yasashii_koi_o_suru/. This is the sequel which I realized is also straight seme/gay Uke. I'm a bonehead! ╮(￣▽￣)╭