Responses
Have you tried Genwaku no Kodou? There is a sort of triangle in that one and because there is a really slow build to any yaoi, it does get pretty tense - plus the story is really good!
I'd give La Satanica a try if you haven't read it yet. It's exactly what you're looking for. Actually, I think most of her mangas have this feeling to them so I'd suggest her other works to.* http://www.mangago.zone/read-manga/la_satanica/
Are there any mangas that are like this: seme and uke are friends and on likes the other but they don`t say it, and the sexual tension is so thick you can cut it with a knife? (๑•ㅂ•)و✧