Any yaoi where uke sees the seme having sex or pleasuring someone else? Thank you!

Sorry i can't answer you. I would like to follow this~

http://www.mangago.zone/read-manga/akuma_chan_wa_momoiro/ You'll have to wait for the rest to get translated if you don't know Japanese but that does happen later on. Check the raws for yourself.

All right! Thank you very much~

If you are interested with this plot i do know just one manga and it is totally recommended.
~ http://www.mangago.zone/read-manga/beautiful_days/ ~

I hope ill see more like this too

http://www.mangago.zone/read-manga/shirouto_yankee_kikiippatsu/ this one also has that scene

Thank you so much

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

Painter of the night http://www.mangago.zone/read-manga/yahwacheop/uu/yahwacheop-chapter-9/1/