There is not currently a fatal ending to Jer's scene. I'm thinking there will *possibly* be a way to get him to digest you toward the actual end of the game(I'm thinking the game's structure will work like phases or chapters where each time you hangout with someone it progresses to the next phase of the night/time passes and the party progresses). I also personally think he's the *last* person to intentionally or unintentionally digest the MC/player and I think he's very upfront about caring about consent and for his prey to really want it. I also believe in his scene he has dialogue where he says he doesn't really wanna gain weight, but does occasionally bulk to work off later and get more muscle.
Ollie does not currently have a playable scene so that would be why. He just has a little bit of dialogue to give ppl kind of an introduction to the character while I work on making his scene :) He's lined up to be the next major update though. Sadly I cannot say when that will be released since I haven't had a whole lot of free time to work on the game.