I agree with tea-sipper that this reminds me more of banana. But kiwis are also a similar sickly sweetness. As I sip more, it transforms into more of a kiwi flavour. Also coming through is… yup, I oversteeped the oolong. But I tend to treat teas poorly when they’re flavoured, since the flavouring comes out more with hotter/longer steeps. That tang might also be the cheesecake. I think I am getting a bit of graham cracker coming through as well.
Kiwi is a good choice for oolong.