Bell isn't in Transylvania. She's in the Abandoned Town. (Not the lab; Just to save some time. I spent 15 minutes going back and forth in there, to find nothing.)
Also, to hold hands with Rinny, you have to continue to say "No" until you reach a list of the options she's given you. Choose "(Next)" and the option of "Have her grow a cock" appears, despite her not having mentioned it prior. Choose that and cycle through the text until it's over, then leave Transylvania. Once you return and Rinny asks you for 'fun', say "No" every time, once again, until you reach the list and choose "(Next)". Once you reach that point you'll see "Ask to/for *******" and that is hand holding.
In return, I have a question for you. How do you get to the graveyard? You asked if Bell was in it, but was that just because you couldn't find her anywhere else? I don't even know if it's part of the game yet, so I figured I should ask another player.