where can you have Lin and Jin?
I should have been specific, not Jin and Lin, but there is a code listed in Lains walkthrough that ads a succubus Violet (I think) who you can fool around with her an Jin in a sort of 3sum thing, I forget to be honest what sex there is, I just remember you fuck them both, there is female on female creampie eating.
To be honest, things are a bit blurred together since I found a pretty close looking Lin for Honey select.
What I do remember clearly is the succubus making you fuck all the girls one after another, including jebus lover and a hot scene with Ellen.