I have been trying to find manga that is like Love Neco, where the Seme is smaller, and/or shorter, than the Uke. I haven't been having any luck. >> Besides reading Isso Mou, Kudokitai! and Papa I Love You by Mishima Kazuhiko (who I love, and I am trying to read all of the Manga she worked on). There are also others, but I can't remember them off the top of my head. >> I'm sorry about that. (But I'm pretty sure Otona Keikenchi was one of them...) Can I have some help, though?

And if the Seme is super pervy and creepy, that would be awesome. 😀 I love the creepy, pervy Semes. They make me laugh. And the bigger, awkward Ukes, who have no idea what to do with them.

Thank you in advance, if you offer anything!

Doutei Sensei!

You can always check the tag uke-like seme here though they might be more personality wise than appearance wise

Thank you! I'll look at them when I got time. XD

Kawaii Akuma - though seme grows in sequel.
Bespoke - a little bit on the bara side.
Bachi Bachi (KIJIMA Hyougo) - Again a little bit on the bara side, but first chapter is still funny.

Maybe you can try this search.

Boku no Shiru Anata no Hanashi The seme was so uke-like, it still has me confused 🤣
Koi Shika Dekinaiyo - pervert stalker seme
Ai no Kotoba o Uragaeshi
Akutai wa Toiki to Mazariau
Arashi no Ato
Koisuru Boukun
Kuimonodokoro Akira
Otona Keikenchi
Harem Days

You can also try this thread:
Surprising roles?
or this one:
Non-stereotypical yaoi, for ex. Short Seme/Tall Uke