did they go all the way or haru just help ren using his hand?

Haru probably jerked both of them off. I think we're all still waiting for the big moment when they go all the way... so it'll be more of a special moment... ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄

Haru will wait until Ren turns 18.
He only kiss and help Him jerk off.