[It takes a moment for what Peter is offering to sink in and then he has Jonathan's entire attention, although his expression is utterly horrified.]

Have you taken all leave of your senses?! You cannot trust me! I cannot even trust myself right now! I need to... to leave this place. Once I'm away, I may be able to regain control, find something else, another option. Anything else.

[But all the same he's rooted to the spot, his eyes locked on the faint pulse of Peter's heartbeat he can sense beneath the skin.]