the impish companion is actually rinny. just ask her to accompany you and go to the graveyard entrance. there will be someone there who you can talk to which will trigger rinny and cause her to be able to bring you over the locked entrance.
If it's not too much of a bother, can you make it possible to reject the girls' feelings? I want to just stay friends with benefits with the girls even after I completed their questlines. Even if not all of them outright say it like Fawn does, the romantic overtones are still there.
