For me it was, apparently, an almost complete rewiring of my libido, so some things that previously "did it" for me, do for nothing for me, anymore, and vice-versa.

Oh, just... so many. Basically my entire body is an erogenous zone at this point, just over a year on E. Some particularly fun and unexpected ones have been my knees, elbows and bellybutton, and I've been able to have orgasms from stimulation of all of the above 🫠 they all feel quite different too, all unique. My partner and I have semi-seriously joked about getting an anatomy chart and marking off areas of it once they've given me an orgasm from each part, and I'm pretty sure we could eventually fill in the entire thing 🫣

My neck has always been sensitive to be honest but today it's much more.

Nipples was more a mental thing pre-transition and became a lot after. Breast are less sensitive (thanks SSRI, nipples too though) but that was wonderful and will again when I'll be better. A lot of things are now linked to situations. If I feel that something was made to dominate me and/or arouse me by someone I feel safe and want something from... My body reacts instantly and I become submissive and shiver from anticipation or touch... I was never like that before. I can switch but that's not the role I prefer.

Oddly enough, if I want to, I can just refrain my body from feeling it, almost all of it.

There are a lot more thing I'd like to discover too but need to find the right partner.

Neck definitely went up a ton.

Not sure if they are exactly “erogenous” for me, but my shoulders started feeling intimate to touch and my cheeks feel nice to rub.