
I think they did it.. because masaya says that "he didn't want to have sex in front of the camera, but his possessivenes took the control".. or something like that... and also while they are filming it seems that masaya became aggressive putting his hand on the head of hikaru.. but I am not an enslish speaking, so it could be that I don't understand well

Don't worry about English. I'm also not native English speaker. We can see it scene by scene together..
- Ch.10 Pg.13 Yukio sends Masa signal.. then Hikaru realizes that Masa just pretends to do.
http://www.mangago.zone/read-manga/shiny_star/uu/v02/c010/pg-13/
- Ch.10 Pg.14 That's why hot-tempered Hikaru turns his face back wanna scold. And Masa just pushes his face back.
http://www.mangago.zone/read-manga/shiny_star/uu/v02/c010/pg-14/
- After that they argued/discussed about it then..
Ch.10 Pg.18 "I didn't want to have sex with you in front of a camera"
http://www.mangago.zone/read-manga/shiny_star/uu/v02/c010/pg-18/

I didnt meant that you had an experience, I just meant that I didnt have one, I I dont have a good imagination to know if it is possible to penetrate like that,
when I saw him put his penis under Hiraku s ass, I just thought that he penetrate the small uke without imagining if it was possible or not.
maybe he just rub his penis under Hirakus ass
He didn't have sex with him on camera? What? Did he just play with his ass? And Masaya just makes out with him, right? It's a little confusing cuz I can't tell if sensei is being modest with the scenes or if it really isn't happening!