Hi

tf is a straight uke?

straight boy gets anally raped or dude who likes dudes figuring out he likes dudes by bottoming

Would love to help you out to search that manga, I would suggest looking through the tag.

http://www.mangago.me/tag/Straight%20uke/?page=3


Recommends.
http://www.mangago.me/read-manga/miwaku_shikake_amai_wana/

http://www.mangago.me/read-manga/motto_musunde_aite_waya/

http://www.mangago.me/read-manga/i_seriously_can_t_believe_you/

http://www.mangago.me/read-manga/koisuru_boukun/

make me bark

usagi chan doshikori moushiagemasu

omg yeessss i love when people become gay

check out:
http://www.mangago.me/read-manga/faded_first_love/
it's very underrated, but is such a gem and fits what you're looking for.

I think this is the epitome of straight uke:

http://www.mangago.me/read-manga/kyuuso_ha_cheese_no_yume_omiru/

(Sequel) http://www.mangago.me/read-manga/sojou_no_koi_wa_nido_haneru/