How about the one they make gay AV?
http://www.mangago.me/read-manga/ikenai_otoko/
http://www.mangago.me/read-manga/dakaretai_otoko/
Ryuuchii, if av is fine then you can check out this tag.
http://www.mangago.me/tag/av/
Do you mind really smutty ones? It's a personal kink of mine. Starting from this page http://www.mangago.me/home/mangalist/44110/?filter=&page=9 Umm, check the ones that i've labelled as cuckolding and voyeur, and the exhibitionism ones where someone is present. I did have those recording while having sex too but i can't remember if i compiled it or not
any yaoi story which have video tapping while having sex? ><
or something like being watch.