
this could be for a lot of reasons. the nerves in the nipple area can be highly sensitive and I’d guess that what you’re experiencing is a mix of normal development sensations, relaxation of your broader nervous system, and some psychological factors heightening the sensation such that you only really notice it when your mind is clear/when you’re calmer like in situations where you’d listen to ASMR, but in reality it’s probably happening more often than you realize.
Uhhhh as a trans woman that also listens to asmr this has not happened to me lmao. But I agree with 1 it could just be them growing in tbh. Like one year isn’t the maximum for boob growth they are still growing. Also I don’t really get tingles from asmr 99% of the time tbh so maybe that’s part of it.